I know this isn't exactly spectacular, but I thought it was cool to play for under $10 a month.
Consumer Depot has 60-day aoc timecards for 18.99 (15+3.99 shipping).
You do get a slight discount if you buy more than one.
Anyways, I found it using a Froogle search (age of conan time card - Google Product Search). The site actually got good reviews and I got my timecard in a lot less time than I was expecting (5 days after I placed the order).
Anyways, again, not fantastic but every bit helps as far as I'm concerned.