mysevenkids replied to your post: you should really block the stuff you have up for sale - makes it look a lot more professional.
Get a cheap set of kids’ foam waffle blocks. You can interlock only as many as you need. You can pin the knitted item to them with thumbtacks and lay it on your bed (or prop it against a wall at night)

Oh, I hadn’t thought of that!  Thanks for the tip!  I’ll definitely look into it!  :)