get your pit pass, the racers are easy to talk with and pose pix with...
you can also get your sponsor stickers at the tech inspection area. those michelin/dunlop/ebc/etc stickers that the dealerships are charging money for is free at the pits.
also, if you see a shoei rep, he will give you a free visor if you ask him. he goes around the pits to give shoei helmeted riders new clear visors.
also, if you need new tires, you can get them at the pit area mounted and balanced for free. tire prices can be haggled.
and... if you have cash on hand, you can buy the factory riders old crashed leathers. they get new ones free after each crash and usually just sell off the old ones. they usually sell em for $500 on up.