What do you mean by the "best deal"?
If you're talking the lowest cost per cartridge, it's hard to do better than Hodgdon's H4198 or IMR-4198. Both are currently readily available. Under a 55 grain bullet, both reach maximum load around 20 grains (depending on whose data you use) yielding around 3,100 feet per second (24 inch barrel). If you can get it locally and skip the HAZMAT fee, then at 20 grains, a pound will yield 350 rounds at a powder cost per round of about 6 cents.
Hodgdon's H335 at a little over 22 grains gets around 3,000 fps and each pound yields around 310 rounds for a powder cost of around 6.7 cents.
My personal favorite is IMR-3031. I put 22.5 grains underneath a 60 grain bullet and get nearly 2,900 fps out of the 18 inch barrel of my Mini-14. I get about 300 rounds out of a pound for a cost per cartridge of about 7.6 cents.