I have Mountain House, but only for backpacking. They are not too expensive and very easily prepared. I like most of the entrees and breakfasts. All the scrambled egg dishes I've had were very good (although I am backpacking). Desserts are way too sweet for me.
A likely somewhat cheaper alternative are the Indian meals in a pouch in your grocery store. Just toss in a pan of boiling water for five minutes and voila!, dinner. I find the different brands vary a bit and tend to prefer the lentils- and potatoes-oriented meals. The pouch meals require more water, but if you need to conserve, you could still (re)use it--you only use it to boil and warm your dinner.