What kind of meats are good for quick or cook ahead preparation, and are reasonably priced?
Pork shoulder/butt is very fatty. You can get a small one, since there's only one of you, and make different things.
For example, you cook it once, and you can have pulled pork to add to salads, sandwiches, omelets, refried beans.

Roasts are pretty cheap, I'm thinking Chuck roast, Sirloin tip oven roast, boneless Center cut pork roast. 
One small roast gives me 3-4 meals. So you can cook 3 roasts at once in the oven and you'll have meat for about 9 meals. 

Chuck steak/beef stew meat, is very cheap, and you can make delicious stews to keep in the fridge or freezer in individual serving containers.

Bacon is expensive, but if you ask for bacon "ends and pieces", it's very, very cheap (and it's also very fatty).

A lot of my suggestions will make way too much meat, if you're the only one eating, but they freeze well in small containers. 

Chicken leg quarters are very cheap and fatty. You can make so many things with them. Shred it for salads, soups, coconut milk curries, or have it whole by roasting in the oven. 

Canned sardines (in water) are cheap, and you can add something spicy to them (e.g. chili paste or paprika) drizzle some olive oil, then broil in the oven. 

If you need help in preparing these foods, leave a comment and I'll try to help.