Probably the usual, free basic install, maybe a 10 dollar a month for 15 month kind of credit, talk to a CSR (may have to play CSR roulette), and ask them for their current offer, letting them nicley know you are 'pricing' other options, maybe get a movie pack for 6 mons, YMMV.
Local retailers may offer their own promotions, as opposed to going directly to D*.
They used to have a page for Current Offers, but I don't know how good or useful it is, link below.