I thought I'd post on this, because I was very excited about this deal. In honor of the upcoming Valentine's Day season, the Dollar Tree is all decked out in pinks and reds. One of the items they had this time was silicone muffin cups. There are six in each package, which of course sells for $1. I got two, thus providing enough for my entire metal muffin tin.
Using silicone eliminates the need for both greasing and purchasing of paper muffin cups. I tried them last night and they work great and clean up really easily. They're usually much more expensive than $1/6, so if you want a cheap way to try them out, swing over to the Dollar Tree!