Best freebie was probably the Sonic tools sample pack followed by a set of Sunex stubby hex bits to test.
I forgot about SK tools. A few years ago when they were coming out with the X Frame ratcheting wrenches, they would give you a free X Frame wrench after sitting through their presentation. Since it took three years for SK to actually release the wrenches i got a 10 mm, 13, and 15mm over three years plus mechanics gloves and their two in one pocket screwdriver. Sadly, SK hasn't returned to SEMA in the last few years.