For DirecTV subscribers HBO/Cinamax is having a free preview. Starting Jan. 15th - 18th. This may also be fore the Dish. Not sure since I am not a Dish subscriber.

Channel Lineup:

501 - HBO & HBO HD
502 - HBO2
503 - HBO Signature
504 - HBO (West)
505 - HBO2 (West)
507 - HBO Family
508 - HBO Family (West)

512 - Cinemax (East)
513 - MoreMAX
514 - Cinemax (West)