-make a big smoothie out of one banana, some frozen berries, two BIG teaspoons of peanut butter, some honey to taste and real milk. I calculated for myself between 700-850 calories.
-5 fried eggs (on toast)
-quick and easy but not cheap: Tuna steaks (just sear the outside, keep the inside raw, quick and tasty) with some fried frozen veggies.
-dried sausages as a snack to go
edit:
orrr why do you say no whey? Do you have trouble with lactose? Because another cheap and easy source would be to chug 1l of milk.