AFAIK, one would only find autofocus on medium format cameras such as the Hasselblad H-series, which is digital...and therefore pricey.
All is not lost, though, as many fine MF cameras can be found on the used market, such as eBay, for reasonable prices. Keep in mind, though, that MF gear tends to cost more than its 35mm counterpart where applicable.
Being a Hasselblad user, I can comment specifically on that brand; if you'd like to learn more, email me directly at dieterzakas@yahoo.com. There are also other brands, such as Mamiya, Rollei and Bronica, but note that in the past few years, some of the other manufacturers have either left the market or gone out of business entirely. (At least with Hasselblad, you can send their products in for service; out-of-warranty repairs do involve money.)
For the film and processing, 120 format rollfilm typically runs about $4-5 or so per roll. Most film manufacturers (Kodak and Fuji, notably) also offer five-roll "pro packs," but without even a modest discount. Most retailers charge a multiple of their single-roll price.
For the processing side of it, if you're shooting black & white, you could develop it yourself at home, once you've made the initial investment in the necessary equipment and chemistry (I've covered what is required in previous answers, so I won't repeat them here.)
I also shoot color transparencies, which I send to an outside lab (A&I) for development, using mailers bought from B&H in New York, at a price less than A&I's, at about $10-13 per mailer (B&H's sku is AIMS). They also offer other services, such as scanning, for an additional fee, which, if memory serves, is $20 per 120 roll.
(You can also look in Shutterbug Magazine's monthly Lab Showcase for additional labs that may be closer to you.)