You aren't getting ripped off, you're paying $8 for your coils instead of $5 -- which are loose but hopefully genuine, and you didn't pay shipping so you're golden. For some reason the others were linking to protank 3 coils, not protank 2, which are different beasts. You can definitely get protank 2 coils for $5 in the blister pack at several places. And now I'm confused, but that's not unusual.
Enjoy the tank! Listen to the guy about getting premaid coils off the slow boat and some wick if you want to get started rebuilding but are feeling kinda errr about it. Rebuilding them isn't hard for most people, but can drive others nuts.