A food puzzle for every budget! You can do so much with toilet paper rolls or paper towel rolls.
Left: a one holed food puzzle. You can make it as easy as you'd like with as many holes as needed.
Right: a catnip dispenser! Cats can forage for other things beside food. Catnip scratch and sniff paper can be used or poke many teeny-tiny holes to dispense loose catnip, valerian, or silvervine!
You can easily turn these cardboard tubes into foraging pinata's that hang and dangle from doorways.
Simply poke a hole in the tube and run a thick piece of cotton string through and tie a knot. Fold in the ends. Make as many openings as desired to dispense the food and boom! A homemade foraging pinata! Hang and let your cats enjoy.

This beautiful blue food puzzle is a rolling tube made with a 3-D printer. The dimensions of the puzzle and holes can be changed to suit your cat's needs, diet, and challenge level! (Right now it's set to "Science Diet size"). You can download the files
This is a fantastic webpage