I always go to vapor dna to order stuff. They constantly have deals going on (10 off of 35 right now) and I just ordered a new rda on Friday night around 11ish and got it yesterday, without paying for extra fast shipping!
As for a good set up, I highly, highly recommend the aspire cf vv ego with a nautilus mini. It's pretty cheap, and has great flavor and looks nice. After that I dabbled with some subtanks, then Rebuildable tanks, and now I'm on rdas building coils like a fiend. And I never thought I'd do it!
But almost anything by aspire has been a win for me. Never had any problems, and their coils last a long time. I had a 5 pack last me about 5 months. Granted, different juices and vaping styles will vary, but I was impressed!