I used "cinay" too just last month. He was very prompt, and I had no problems at all renewing my account with the code he emailed. He'll even IM with you if you are having any problems. I was skeptical, but it worked. It's less than $100, so the PayPal and eBay buyer protection programs are more than enough insurance if you are worried about doing it this way.
Of course, I did this only a couple of days before my account expired. I then cancelled my order from Amazon.com. I ordered the renewal box through them, and after waiting for it to ship FOR 5 FREAKIN' DAYS through their "Super Saver Shipping", I decided they didn't deserve my money. 5 days and they couldn't throw a little box in a bigger box and ship it. Whew, sorry about the rant. I just boycotted WalMart too, but that's a different customer no service story. I'm done now.