Sharon asked in the comments about cabinet pulls. I found my kitchen knobs first at Lowe's, where they were well over $3 each. I bought one there, and since we had the name of the manufacturer and the style, John and I raced on different computers to try to find the best price. He ended up winning by a few pennies. I think technically his cost more per knob but the site he found had free shipping. We ordered 40 (a few more than we needed) for about $80.
I don't remember the name of the site, but here are a few to get you started:
Cool Knobs and Pulls
Knobs and Hardware
But keep in mind that if you find something you like locally, you can always try to find it online. That also works if you can't get the quantity you want locally. Know any other sources? Please leave them in the comments.