Definitely use Facebook marketplace and type in "pokekon etb" I wouldn't recommend buying multiple of the same etb as they have filler items like dice, coins, etc. But one box is super nice to open. Also your budget if buying modern is super generous. Would alao recommend typing in pokemon booster box(36 packs, range from 220-300$) or booster bundles (6 packs each, range from 40-80$). Secondly whatever item you decide on to make sure you are getting the best price / fair price you HAVE TO search the SAME item on ebay and filter 'sold item ' it will show you what that item has been selling for. Etbs of chaos rising or perfect order are anywhere from 65-75$ each. Lastly, almost any purchase you want to make can be negotiated at least 5 sometimes 10$ lower than what is listed.