I like heavyweight gainer 900. Keep in mind you can adjust the scoop quantity to eat less of it so you aren't necessarily gaining weight. If you search on google with that keyword you can find 7lbs(21 servings like 630 calories each) for about 25-30 dollars at the lowest I believe. Low in sugar, high in protein, low in fat great tasting and mixes well. Also has glutamine and vitamins/minerals.
Let me know if I can find the cheapest price for you....
SuKY