Hi All - Im picking up my 2014 Q5 this week!

This is my first audi and I am thrilled. Question about bike racks. I hate roof racks and prefer a hitch rack. My car does not come with a hitch so my question is - should I get one from Audi (stupidly expensive) or are there good after-market options (and if so, where). And if my only choice is Audi, where is the best online place to get a little discount.

Ditto for the rack itself.