THE DISCOUNTED PREPAID ITUNES CARDS that I mentioned last week came, and I used some last night. It took me a while, as the card says to click the "prepaid card" button on iTunes, but there wasn't one. (Maybe there is on the Mac version?) I had to go to my account information, and treat them as gift certificates, but that worked.
Ordered a few tunes, though I passed on buying Jennifer Garner's playlist. Her taste in music isn't bad, but it's not mine.
UPDATE: Yeah, yeah, as about a gazillion readers have emailed, the "prepaid card" button -- it's actually more like a link -- is over on the lower left. It's not very conspicuous, but I'm still surprised I missed it. Oh, well, I made it work anyway.