Unless you buy Norinco crap, 45 ammo and really cheap are a contradiction in terms. The cheapest non Norinco seems to be the 100 rd boxes of Winchester that Le Barons sells (when they have it) @ $39/100
Buy Norinco, shoot it for practice and then reload the brass with quality reloads.
I just got Thureon Defense .45 ACP and I'm thinking on doing reloading soon(for the first time) and if you can give a idea on how much it will cost me to get the equipment.