Most chip collectors pick up enough chips when they are at a casino, to have some to trade with other collectors. They have their chips in their collection, and they have their chips to trade. How about starting a 3rd group? Those chips can be the ones that go in your giveaway pile!
As you become more involved in the hobby, you will run into those who have never collected, but find the hobby interesting. If you end up giving that person a chip or two from your giveaway pile, you just might bring a new collector into the hobby. And end up making a trading partner at the same time.