Most POD shops offer a similar selection of products to get the art of your choice printed on, including clothing, stickers, masks, tech accessories, wall art, home & living, pet accessories, and stationary.
Many of the shops have unique items that you can't get elsewhere.
Society6 – My personal favorite! A ton of unique products including credenzas and other furniture, acrylic trays, etc. Can be difficult to navigate, but their prints are top-notch and they offer the most variety of items.
Threadless – Unique products include shoes, cut-and-sew shirts where the artist designs the sleeves and collar, skateboards, etc.
Redbubble – Unique products include A-line dresses, pet accessories
TeePublic – Not a lot of variety here, but their teeshirt prices are extremely competitive.
Etsy – Currently I sell digital downloads of my art (mostly in the form of zoom backgrounds).