First, make sure of the legalities of buying a firearm outside your home state. Don't want to make the trip for nothing, right?
I haven't seen the drums sell for much under $100. If you get anywhere close to $80, you're doing very well. If it gets any lower than that, I'd carefully check it for damage. Buyer beware!
Hopefully someone else comes along shortly to give you some better information than I have.
Buying a "tacti-cool" AK from a dealer will be expensive. Going that route, you're probably better off to build it the way you want for yourself. I've never found one customized exactly
like I want... so I am building my AR myself. A slightly different project, but the same general idea.
If you can find an individual, though, who no longer wants the one he bought or built, that will be your best deal.