I bough this twice... Niteangel Natural Living Tunnel System, Small Animal House https://www.amazon.com/dp/B00OW6ZO9U/ref=cm_sw_r_cp_apa_i_BdOjEbZ4HHKKS

This looks good... ZALALOVA Hamster Chew Toys, 10Pack MSDS Approved Natural Wooden Pine Guinea Pigs Rats Chinchillas Toys Accessories Dumbells Exercise Bell Roller Teeth Care Molar Toy for Bunny Rabbits https://www.amazon.com/dp/B07MK1BY27/ref=cm_sw_r_cp_apa_i_oeOjEbWTA3JBT

Kabobs are great. This one is a nice cheap Amazon add-on gift... Kaytee Perfect Chews for Hamsters https://www.amazon.com/dp/B0040HFQGM/ref=cm_sw_r_cp_apa_i_qgOjEbZR2294M

My mice like this nibble toy... Kaytee Nut Knot Nibbler https://www.amazon.com/dp/B0002DJEYI/ref=cm_sw_r_cp_apa_i_GiOjEb5B1Y1NG

I bought this but sent it back because you have to put it together. If you have the patience I bet it's awesome.

Activity Assault Course - Hamster & Small Animal Toy https://www.amazon.com/dp/B008HRLM1E/ref=cm_sw_r_cp_apa_i_BlOjEbRN7CWGR