eBay....cheap brass, but watch the shipping. You can get a lot of brass in a flat rate box. The shipping cost on those is $8.10, but expect folks to tack on another $1 or $2 for their time.
Expect to make loads for approximately 40-60% of retail cost of factory ammo. Depends on what you are loading, components, prices, etc. Buying components in bulk seems to help spread the shipping costs out.