Just contact them yourself. Got to their site.... usually they offer promo packages that you purchase, for like about 3 months or even a year. Obviously, the longer, the better value you get, but more expensive at the same time.
If you dont find any info on their site, call them or email them, and request for a promo package and they will tell you if its available.

If they see you are persistant, they usually upfront with you.
Keep a couple of things in mind. Sometimes you will get shit that you will not spin, so make sure you like a lot of their artists.