Funny stuff, my Dad started 15 years ago. He bought nothing but a box call and a slate call, headnet and gloves I think one foam hen decoy. Total of probably 50 bucks, he likes the cheap stuff. Add 2 boxes of shells, remington and winchester. He only bought those because he wanted to see which one pattenered the best. Oh yeah, he was shooting a remingotn 1100 2 3/4" shells with an Improved cylinder choke. His range was 25 yards and he killed doing this.
There was a total of $50 bucks spent that year and the only money spent after that the following years was a new box of shells.
You dont "NEED" anything but a couple good sounding calls, camo if you dont already have it, maybe a decoy or 2, and a box of shells. Throw in some bug spray and you can kill turkeys like anyone else.