Hey, I've got season tickets and am from Jersey. I am not too sure about the hotels and stuff. For tickets, you can check stubhub or other online ticket places for tix. I dont know any other places that you wouldn't know of...They have NYG tickets exchange but you wont find anything on there.
The only thing I can tell you is to make sure you buy a parking pass since there is renovation going on with the new stadium and limited parking. Since last season, they will not allow you to park on the Giants Stadium premises without a parking pass. I know there are a few hotels in the area, but they might be expensive. I think the Sheraton is right next to the stadium, but I could be wrong on the name...
The Stadium is right off the NJ Turnpike, which leads to NY. You could hop on the turnpike and go down in NJ to probably find a cheaper hotel. If you need more info or anything specific, let me know by PM.