If you have, like, several bags or boxes of stuff I would wait for a Shred-It event. Usually it's sponsored by a t.v. station and Farm Fresh and you just take in a small donation (items, not $$) for whatever cause they're collecting for and they will shred everything you bring them. When they were doing those events for the food banks, most people would just bring in 1 item for each bag/box of stuff they brought in.
If you buy a shredder remember not to sit down and try to shred a whole bag of stuff in one sitting. It's hard on the motor. Just take a stack of papers -- a few inches worth -- shred them and then let the motor rest. Household shredders aren't meant for heavy duty shredding.
Also I would buy one of the criss cross shredders. Instead of straight lines of paper it actually shreds it both ways.
You may also want to do this and use the shredded paper for the cat's litter box -- or see if someone else would want to use it in this manner. I've heard of lots of people doing this. We don't b/c we simply don't have enough stuff to shred to keep the box full, but if you've got lots you could keep yourself, or a friend, in free litter for months!
The whole point of turkey is to get to the pie.