I literally have never met someone who pays the $300 for Sunday Ticket, and I've never heard of DirectTV enforcing the $300 price tag. Sounds like you've had some terrible luck.
I notice you replied to everything except for Rewind.
The fact remains that there are many options depending on device, and the fact that you don't realize the price of DirectTV Sunday Ticket tells me that you seem to be more willing to cheat them than to find the right deal.
Seriously, if you want to cheat DirectTV call them up, go to retentions for cancelling service, and get FREE (or heavily discounted) Sunday Ticket, just like many others.