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You need to eat more. You have expensive items in your diet that can be added to, or replaced with cheaper, and higher nutrient density foods, but may require more prep time and cooking time.
Instead of bagels, frozen waffles smeared with peanut butter. Go cheaper and buy bisquick and make a batch for less.
Instead of a can of beans, buy a bag of dried beans and cook and prep those. Tons of protein.
Instead of individual prepackaged sausages, buy a pound of ground turkey breakfast sausage.
I would also add more veggies, squash, cucumbers, arugula for your shakes, olive oil and balsamic vinegar for salad dressing.
Rice is a big carb item. Long grain basmati rice is cheap.
Canned tuna/salmon to splurge.
Spread your meals out. Eat a big breakfast, then small lunch, small snack, small dinner. This keeps your insulin levels balanced instead of a big spike and then taper off to nothing.
Buy whey and a can of hersheys cocoa powder, use the arugula. Whip in a blender with whole milk.
I don’t think 60-100 a week is really a poor man’s diet at all. I’m hitting around 4K calories a day off about $60-70 a week and I’m not budgeting the best that I can.
But to add to that diet I’d probably drop the sausage for chicken, ground turkey/beef or tuna. And if you’re bodybuilding then I think you need to reassess your diet a bit. Protein seems to be pretty low and I’m not sure what your caloric needs even are.
Ground beef. Rice instead of bagels (I think it will be much cheaper per serving but could be wrong). Frozen veggies/ fruit. Greek yogurt.
Honestly if you’re buying pre made protein shakes you are better off just eating real food from a nutrition and budget standpoint.