Ok, then you should have most of the same stuff available. Here are some ideas (a mixture of commercial toys, DIY toys, and things you can find at craft stores) :
-Nut Knot Nibbler (toy that they have to take apart to get the treat)
-Apple branches
-Willow branches and baskets
-Hanging bird toys (go for wooden ones, not plastic, and avoid rawhide/leather)
-Cholla (cactus) wood
-Yucca wood (always a favorite!)
-Cardboard toilet paper rolls stuffed with hay and treats
-Ledges (they have ones that clip on, designed for chinchillas)
-Wooden bird ladders
-Pumice stones (hit or miss but so cheap it's worth a shot)
-Grapevine (grapevine balls are especially useful as you can stuff hay in them and they can be rolled around)
-Brown paper bag stuffed with hay, food, and treats and rolled up
-Wooden spoons (can be chewed and tossed)
-Toys with bells (try both the small animal and bird sections)
You can also try scattering and hiding his food to encourage foraging. Degus are active, intelligent animals so they really thrive when they have stuff to do

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