A local paintball store here sells them for about $30 (filled), and about $2-3 for a refill. You can also get them from WalMart
or sporting goods stores.
I agree, the regulator and the tank aren't exactly svelte and sexy like the ADA stuff, but the Red Sea package offers a good combo of a smaller size, and the convenience of a complete package (aside from the bottle, no additional parts to mess with). It addressed my requirements better than other pressurized options.