[Sero]

how do you sell 25 items anyway? do you need sparkcash houses? xD

Hmm, what do you mean? Like, how to sell 25 pieces of an item? Or did you mean vending? If you meant the vending part, then you're partly correct! Not sparkcash houses though but this premium item called Sign of Tycoon. It increases the number of slots you have for vending, from the default five, to God knows what xD

EDIT: Can be found on the Housing section of the store. Just in case you'll look for it in the future