I think I'll let the pic do the talking first...
I updated this, as a lot of stuff went.
If you're interested in any of these, PM me and tell me which ("top row, third from left"
Shipping for the little envelope was always $2 at USPS, so unless you buy all of them, shipping is a flat rate $2 to the USA.
PM if elsewhere.
Any knob in this pic, $3 each, unless you buy multiples. And that's a flexible policy, too!