Not to keep bumping this topic, but I figured out why I couldn't make my order go through earlier.
The site ripped me off $65.70. After entering my info and going to checkout, the site gave me an "Oops!" message and redirected me to the front page. And my debit account was drained $65.70, without the order being placed. The reason it wouldn't allow me to place the order after that was because at the time I didn't realize I had been charged, and I didn't have enough money left in checking to place the order a second time. I didn't go through with my second order because of this, and I already emailed them. Hopefully this will be resolved quickly. I'll let you all know how it turns out, assuming any of you care.