I agree that nuts and nut butters are a great option, but if you're in the mood for something less "healthy" then you could try Kashi GoLean Crunch Cereal. Amazon has them for a little over 17 bucks for 6 boxes (if you do the subscribe and save option). Less sugar than other granola type cereals, and relatively high in protein and fiber. I like munching on them to satisfy my sweet tooth.