There aren't any post workout supplements that doesn't have protein powder in it in some shape or form that I know of. Unless you're thinking of something that you need to sneak across the border for. Creatine has been mentioned, multivitamins and fish oil perhaps? None of it isn't exactly going to be beneficial post workout anyway. What you need post workout isn't a "supplement" as such but REAL food. If you can fit a shag in before that's great for conditioning and cardio.
Those protein bars are bloody expensive and you don't get very much for shelling out so much coin. GTFO of those and buy some food lol. Or drink a carton of milk, that'll fill ya right up.