We've had Direct TV for years. The bill goes up $2 every year, without fail, with no changes to our plan. We do not have a high end plan (no HBO, pay channels, or sports pkgs, etc) and our "average" bill is about $70/month. We do not have THE LOWEST plan, b/c we want Fox News, Boomerang, and a few other channels, but it is not the highest 'plain' plan either.
That said, part of it is b/c they charge you about $6 for each additional box (after the first one), and we have the one extra box. We also live in a rural area and cannot pick up "local" stations without paying the extra $6/month for that, too. So maybe if you only have one box (no secondary TV's hooked up) and get your local TV over the air, then you could get a plan for $60/month or so that you could bundle with your AT&T plan for a discount.
We have our internet via AT&T. I have heard that satellite internet is a pain...like when your TV reception goes out on a windy day or a rainstorm? Well, that is what you are dealing with when sending and receiving date via internet via satellite.
At one time, we had a bundle with the two plans (no AT&T cellular service, b/c we can't get a signal at our house through them)--home phone, internet, and Direct TV. I think Direct TV and AT&T each gave us like a $5/month bundle discount. Total of about $10/month.
ETA: Oh. and check around like ItsACrazyLife said. We signed up for a special short term plan change (NFL Sunday Ticket for one season) and when I cancelled it, they said the bundle we originally had with AT&T was no longer available, and since it had been gone for so long we had been receiving it grandfathered in, until we changed our plan by upgrading to add the SUnday ticket. I was never able to get it back. And ALL of the fine print I read on those offers I get in the mail every month say that you must be a new customer. I'm not sure with which--At &T or Direct TV. But it doesn't matter, b/c we aren't new with either of them.
I did manage to get Direct TV to credit our account $10/month for about 18 months after they said they couldn't get me back the bundle we had had. ONLY because I had very specifically asked the sales person at the time we ordered the Sunday Ticket if it would cause any other changes in the cost of our plan, and if we cancelled it would we revert back to the same charges and she said yes. It was a pain to have to keep calling them to continue the discount every 6 months though... because the customer service reps could only stick a 6 months credit on the account each time, as that was their limitation (6 months out).