I am a relative newbie here, just finished my second week of radiation (ten shots down, only 27 to go!), so I might be barking up the wrong tree here, because y'all may be talking about very specialized canned meals...
However, in one of the guides and pamphlets I was given, published by a prof at the H. Lee Moffitt Cancer Center in Tampa, under Nutritional Supplements (like Boost and Ensure) was the following statement, "A economical alternative to canned supplements is powdered Carnation Instant Breakfast. Glucerna may be recommended for diabetics."
Additionally, one of my RadOncNurses recommended CIB.
Be kinda hard to say Carnation Instant Breakfast didn't qualify for food stamps
It really pays to read the labels on this stuf also because there are a whole bunch of different Boost and Ensure products out there, as well as store brands like Wal*Mart, Safeway, etc,.
Also, the ones marked Plus seem to all be 350 calories in the same size container at the same price, so one can get more for less money, less swallowing or less time, whichever tends to be most important to you at the current time.
Helps to make the rounds of these stores (be sure to get a store discount card if they have them -- Use a fake name if you don't want to be ID'd in marketing systems) to see what's on sale as something usually is somewhere!
Pete