Guys, I found out why the price is so low. Shipping costs around $16 for one bag. ADG's 9l bag is $45 with free shipping, so ADG still has the best deal.
Good catch... unless you're combining shipping with a bigger purchase, the prices are the same ($14 shipping with UPS to WA).
I did get a good deal on the new 45cm Aquasky through AFA though. $75 less than ADG was quoting.