you would be surprised how usefull a dremmel tool is also check Lowes or HDepot for cheapest prices,also save a couple of bucks and get your glue there also.
I buy alot of my building materials at the hardware outlets its good to shop around for deals on the basics.
a good foam for tanks and batterys etc... you can get at art suply stores I am not sure what they call it but its for packing photo's ,you can tear it into any size you want but it also breaks into 1X1 inch squares and works really good for holding things in place and you can make diferent shapes.