I've taken the stickers & business cards down temporarily.

England's under lockdown right now. The national (& local) post office/postal service/Royal Mail is currently staying open for now but we're only meant to leave the house for essential business, or exercise, and follow social distancing rules/avoid other people while out.
Nobody's buying them; I'm nearly out of stamps; some of the listings need photos, & I need to find out what new postage prices are anyway.

Sorry if you were planning on buying some soon.