Songs Show as Purchased But Can't Download!

I have 2 songs that I purchased on iTunes some time ago. I switch music out on my iTouch frequently, and I took those 2 songs out of my library.

I looked for them to download again and couldn't find them. No worries--I figured I'd just buy them again. But when I go to the iTunes Store, BOTH songs say "Purchased". So I can't buy them again but I can't find them, either. Please help.