Mini-Individual Heavy-Bottomed Baking Cups for Cupcakes

I am looking for mini-baking cups with a heavier bottom than its sides to be used for making cupcakes. They must be oven ready.

At the IACP conference at the Chicago Hilton in mid-April, I thought that someone mentioned that these were available through the King Arthur website, but I had no luck.

Can anyone on this forum help me? I need a quantity by May 14th.

Thanks

I did a search on mini muffin pans, and while I came up with lots, I didn't see any that mentioned the bottom being thicker. The most interesting was this site that had mini muffin pans and 40mm grenade pouches (OD green):

http://www.instawares.com/mini-cupcake. ... WAodIidkVg