Buy a jug of Alliant Promo and you'll be shooting for a *long* time for less than $100.
Second that. Picked up an 8 lb jug for 85 bucks a couple of weeks ago. 8 lbs of powder makes a whole lotta pistol rounds. Use Red Dot data and work up conservatively.
Unique is another great choice. I load that in 9mm, .45, .44 mag and 12 ga. And .38 and .357 occassionally.