Yes. I called today, to make sure, and they said cash is fine. Last year, I had to buy a gift card first, which wasn't a big hassle; took another five minutes max, but they're saying that step isn't even necessary this time around.
That said, I decided that I didn't feel comfortable carrying that much cash around while standing in a long line, so I'll be using a card anyway. 15 minutes on hold for nothing. Here's hoping it helps someone else.