Open Stock Sheets Open stock sheets are great when you don't need an entire sheet set. Open stock allows you to buy flat sheets, fitted sheets and pillowcases in any combination you desire. Open stock also works well for people with king size beds, but who need standard pillowcases instead of king pillowcases. Linenplace offers a great selection of open stock sheets in a variety of styles and prices that range from $110 for a Duet Damask Stripe queen flat sheet to $326 for a luxurious Urban Collection modal queen flat sheet.