cheap enrichment for old corgi

Fah is 7 now and gets bored very fast, so i make toys from what we have at home. Old towel rolled up and tied in knots, put kibble inside, he work it for 20 min. Empty toilet paper rolls with treats hidden in them also good. Cardboard box with holes cut for a snuffle, Fah loves it more than the expensive toy from the shop. Its free and he is tired after, that is the goal.