Just got off the phone with DISH and I thought I'd share the info I got from one of their reps.
so here goes:
The minimum or shortest contract they offer is 2 years without an activation fee. By going with this option you could go with their "Smart Pack" at $19.99 a month and get Pac 12 Network. If you decided to cancel or break your contract then you'd have to pay $17.50 a month for the remianing months on your contract. So for example if DTV and Pac12 Net came to terms in a year from now and you decided to cancel DISH you'd have to pay $210 for the remaining year.
You can pay a $99. activation fee up front to waive a contract or without a contract and have the same package of chanels as the "Smart Pack" that includes Pac12 Net and pay $24.99 a month with no cancelation fees attached and you can cancel the service at any time with no strings attached.
So if you decided to supplement you DTV or whatever other service you have with DISH to watch PAC 12 Net and say you canceled within a year, you'd save $50 by going with the latter option. The latter option would be ideal anyways just incase DTV and PAC12 came to an agreement in less than a year cause you wouldn't be obligated to early cancelation fees.