Headset
Buy the best you can afford, but don't get crazy, you've got a long way to go. I use the David Clark 13.4 without ANR. ANR is really nice and I'd like to have it, but my regular DCs work just fine.
Flight bag / Black
Sportys "flight gear super duper bag" = $50-80
Champs Sporting goods black gym bag = $10
Kneeboard
Sportys Super duper kneeboard with extra pockets = $30-50
Wal Mart clipboard = $1
Flashlight
Super duper headset light = $40
Mini Maglight with red filter = $20
CR-3 flight computer & standard plotter are available at the pilot shop.
Hand held GPS is nice, but you still have to learn to use VORs, so you won't be able to use it on a check ride. As if you could get really lost in Florida.
Hand held COMM, nice to have as a back up but I finished all my trainig without one. A cell phone is just as good.
Check lists, maps, and other stuff are at the pilot shop.
Books
Wait till you get there, then ask around about what you really need. You'll have plenty by the time you're done.
Other gadgets and gizmos = waste of money
I wasted a lot money on junk I don't need or use.