Driving around searching is expensive. Hazmat fees are not that bad if ordering 4 or more pounds, plus primers can ship on the same fee.
Going to a gunshow will cost you about as much as hazmat, and you are not guaranteed they will have what you want.
Believe it or not, there's a thing called a "telephone" that everyone has and no one uses anymore. : )
Much cheaper than driving! And a lot faster, to boot.
But yeah, buying in bulk mailorder is the only way to actually save money on powder. None of the local places can touch Midsouth/Grafs/Wideners/Powder Valley.