Where can I find replacement feet for my MacBook Pro?

I had an old Powerbook G3 that had lost 2 of it's rubber feet. Instead of trying to replace them with the same ones, I just went to a hardware store and bought the little rubber stick-on feet that you could put on the bottom of furniture or a TV stand or whatever. Cost all of about 99 cents and worked perfectly.

They looked something like this:

I just got back from the Genius bar and actually had the exact same issue. I had two feet fail, both having different attachment methods. The foot under the upper left of the keyboard was attached without any adhesive, the foot had plastic "feet" that "snapped" into a black metal piece attached to the bottom case. The foot under the lower left of the keyboard was attached with adhesive to the outside of the bottom case and further secured with an additional plastic ring running along the inside of the bottom case (this ring broke apart from the foot in addition to the adhesive failing on my machine).

I went to the local Genius bar and the cost of the bottom case ended up being covered by apple care. Even if apple care had not covered the bottom case, the bottom case was only $38.89.

You can find a set of 4 replacement feet (along with other Mac replacement parts) at PowerBook Medic

They sell the set of 4 here. You can also get a single foot.

http://www.pbparts.com/shop.php//0761398.html