Yes, petstores will take fish off your hands. They won't usually pay you, but will let you exchange it for some merchandise.
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If I buy a bigger tank, they will always grow and the tanks will always get too small? Right??
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Not if you get fish that don't grow too large. Petstores are terrible in that they sell baby fish that will grow VERY large (arrowanas, Oscars, etc) or fish that cannot be kept in a home aquarium on maturity, and either don't know or won't tell people how big they get.
There are a great many kinds of fish that would be very happy in a 30gal!