I bought all of the three pack sets and the vehicles at TRU's around Toronto. I didn't buy duplicate figures at the time - so when the Viper 3 pack came out I only purchased one, and left about 20 or 30 on the pegs.
I remember the slugger sat around for about 2 years after - same with the conquest Jet from the next year.
I don't remember ever seeing the stars and stripes pack otherwise I would have purchased it, and the only vehicles I don't remember seeing was the Rattler A-10.