When I used to use gainer shakes in college, MHP Up Your Mass was my favorite as well. Now I just make my own and save a bit of money. I typically do 12-16oz milk, 1-2 scoops of whey, 1tbsp of PB, and 1/2 to 1 cup of oats. Depending on calories I'll add in honey too.
I've found making your own...