you can also use hog feed if you cant find any rodent block. you want at least 15 or 16% protein but not much more than 20%. I buy hog feed from TSC right now.
I breed asfs and the regular ole rat. Asfs might be a good option for you right now if your looking to feed 1 or 2 snakes, (I know you said you didnt really want to). I consider the rats a lot of work because i spend more time and effort caring for them than i do my snakes.
I prefer a rack over tubs because they are easier to clean, for me. Plus putting all the hardware cloth in the sides of the tubs and everything is a good amount of work too.