The Binding of Isaac Four Souls Requiem Shop Upgrade! Alt Art Kickstarter Card | eBay
Steam Workshop::Better Shops
Rooms - The Binding of Isaac: Rebirth Guide - IGN
Steam Workshop::Mystery Gift (BOOSTER PACK #1)
Steam Community :: Screenshot :: Two Steam Sales = everything in a shop is free. The Refresh = shops never run out. Using them both in a shop with an upgrade? Every upgrade.