There are a few different factors which will determine how you can price your cards on the market, including condition, if its a set, rarity, and overall demand
Megalosmasher X X WATER Level 4 [ Dinosaur / Normal ] ATK 2000 DEF 0 With its sound-baffling armor and gargantuan jaws, this primeval predator's phosphorescence was the only possible pardon for its primitive prey

[1] Pineco (Violet ex) [2] Heracross (Violet ex) Shroomish (ex Starter Lucario) Breloom (ex Starter Lucario) Cacnea (Violet ex) Cacturne (Violet ex) [7] Tropius (ex Starter Lucario) [8] Scatterbug (Violet ex) [9] Spewpa (Violet ex) [10] Vivillon (Violet ex) [11] Skiddo (Scarlet ex) [12] Gogoat (Scarlet ex) [13] Sprigatito (ex Starter Lucario) [14] Floragato (ex Starter Lucario) [15] Meowscarada (ex Starter Lucario) [16] Tarountula (ex Starter Lucario) [17] Tarountula (Violet ex) [18] Tarountula (Violet ex) [19] Spidops ex (Violet ex) [20] Smoliv (Scarlet ex) [21] Smoliv (Scarlet ex) [22] Dolliv (Scarlet ex) [23] Arboliva (Scarlet ex) [24] Toedscool (Violet ex) [25] Toedscool (Violet ex) [26] Toedscruel (Violet ex) [27] Capsakid (Violet ex) [28] Capsakid (Violet ex) [29] Scovillain (Violet ex) [30] Growlithe (ex Starter Ampharos) [31] Growlithe (Violet ex) [32] Arcanine ex (Violet ex) [33] Houndour (Violet ex) [34] Houndoom (Violet ex) [35] Torkoal (Scarlet ex) [36] Fuecoco (ex Starter Ampharos) [37] Crocalor (ex Starter Ampharos) [38] Skeledirge (ex Starter Ampharos) [39] Charcadet (Scarlet ex) [40] Charcadet (Scarlet ex) [41] Armarouge (Scarlet ex) [42] Slowpoke (Violet ex) [43] Slowbro (Violet ex) [44] Magikarp (Scarlet ex) [45] Gyarados ex (Scarlet ex) [46] Buizel (Scarlet ex) [47] Floatzel (Scarlet ex) [48] Alomomola (ex Starter Mimikyu) [49] Clauncher (Violet ex) [50] Clawitzer (Violet ex) [51] Bruxish (Scarlet ex) [52] Quaxley (ex Starter Mimikyu) [53] Quaxwell (ex Starter Mimikyu) [54] Quaquaval (ex Starter Mimikyu) [55] Wiglett (Scarlet ex) [56] Wiglett (Scarlet ex) [57] Wugtrio (Scarlet ex) [58] Cetoddle (Violet ex) [59] Cetoddle (Violet ex) [60] Cetitan (Violet ex) [61] Dondozo (Scarlet ex) [62] Tatsugiri (Scarlet ex) [63] Magnemite (Violet ex) [64] Magneton (Violet ex) [65] Magnezone ex (Violet ex) [66] Mareep (ex Starter Ampharos) [67] Flaaffy (ex Starter Ampharos) [68] Pachirisu (Violet ex) [69] Rotom (ex Starter Ampharos) [70] Rotom (Violet ex) [71] Toxel (Violet ex) [72] Toxtricity (Violet ex) [73] Pawmi (Violet ex) [74] Pawmi (Violet ex) [75] Pawmo (Violet ex) [76] Pawmot (Violet ex) [77] Wattrel (Scarlet ex) [78] Wattrel (Scarlet ex) [79] Kilowattrel (Scarlet ex) [80] Miraidon (Promo) [81] Miraidon ex (Scarlet ex) [82] Drowzee (Violet ex) [83] Hypno (Violet ex) [84] Ralts (Scarlet ex) [85] Kirlia (Scarlet ex) [86] Gardevoir ex (Scarlet ex) [87] Shuppet (Violet ex) [88] Banette ex (Violet ex) [89] Drifloon (Scarlet ex) [90] Drifblim (Scarlet ex) [91] Flabb (Violet ex) [92] Floette (Violet ex) [93] Florges (Violet ex) [94] Dedenne (Scarlet ex) [95] Dedenne (ex Starter Mimikyu) [96] Klefki (Violet ex) [97] Fidough (Scarlet ex) [98] Fidough (Scarlet ex) [99] Dachsbun (Scarlet ex) [100] Flittle (ex Starter Mimikyu) [101] Flittle (Scarlet ex) [102] Flittle (Scarlet ex) [103] Espathra (Scarlet ex) [104] Greavard (Violet ex) [105] Greavard (Violet ex) [106] Houndstone (Violet ex) [107] Mankey (Violet ex) [108] Primeape (Violet ex) [109] Annihilape (Violet ex) [110] Meditite (Scarlet ex) [111] Medicham (Scarlet ex) [112] Riolu (ex Starter Lucario) [113] Riolu (Scarlet ex) [114] Lucario (Scarlet ex) [115] Sandile (Scarlet ex) [116] Krokorok (Scarlet ex) [117] Krookodile (Scarlet ex) [118] Hawlucha (Scarlet ex) [119] Silicobra (Scarlet ex) [120] Sandaconda (Scarlet ex) [121] Stonjourner (ex Starter Lucario) [122] Klawf (Scarlet ex) [123] Great Tusk ex (Scarlet ex) [124] Koraidon (Promo) [125] Koraidon ex (Scarlet ex) [126] Grimer (Scarlet ex) [127] Muk (Scarlet ex) [128] Seviper (Scarlet ex) [129] Spiritomb (Violet ex) [130] Croagunk (Scarlet ex) [131] Toxicroak ex (Scarlet ex) [132] Pawniard (Scarlet ex) [133] Bisharp (Scarlet ex) [134] Kingambit (Scarlet ex) [135] Maschiff (Violet ex) [136] Maschiff (Violet ex) [137] Mabosstiff (Violet ex) [138] Bombirdier (Violet ex) [139] Forretress (Violet ex) [140] Varoom (Scarlet ex) [141] Varoom (Scarlet ex) [142] Revavroom (Scarlet ex) [143] Iron Treads ex (Violet ex) [144] Chansey (Violet ex) [145] Blissey (Violet ex) [146] Zangoose (ex Starter Mimikyu) [147] Zangoose (Scarlet ex) [148] Starly (Scarlet ex) [149] Staravia (Scarlet ex) [150] Staraptor (Scarlet ex) [151] Skwovet (Violet ex) [152] Greedent (Violet ex) [153] Indeedee (Violet ex) [154] Lechonk (Scarlet ex) [155] Lechonk (ex Starter Lucario) [156] Lechonk (Scarlet ex) [157] Oinkologne (Promo) [158] Oinkologne ex (Scarlet ex) [159] Tandemaus (Violet ex) [160] Tandemaus (Violet ex) [161] Maushold (Violet ex) [162] Squawkabilly (Violet ex) [163] Cyclizar (ex Starter Mimikyu) [164] Cyclizar (Violet ex) [165] Flamigo (ex Starter Ampharos) [166] Arven (ex Starter) [167] Beach Court (Scarlet ex) [168] Crushing Hammer (ex Starter) [169] Defiance Band (Scarlet ex) [170] Electric Generator (Violet ex) [171] Energy Retrieval (ex Starter Mimikyu) [172] Energy Search (ex Starter) [173] Energy Switch (ex Starter Lucario) [174] Exp

Although some of the packs slipped through unnoticed, a black triangle was eventually printed on top of the symbol for the remainder of the packs printings so that they could continue to be used and not destroyed
This article will help you understand when you can and cannot use them
A decent way to keep distributing counters if you have excess mana to dump into it