The “snak shak” toy is very popular with my gremlins currently. The large one is about $10 and lasts a while, even with very intense chewing. It’s like this very hard rabbit-safe compressed wood. It’s kinda junk-food-ish, but it’s so hard that they aren’t eating a lot of it at once.
The willow bowls from BB also seem to last a good bit of time with mine, as do the seagrass mats. As for DIY, you can make a newspaper mat, or give a phone book (if you can find one), they are great for them to tear apart! Cardboard boxes stuffed with paper are also very popular with mine.
Depending on your area, you also might be able to collect safe twigs and branches for them. Palm fronds and bamboo leaves are fun and safe (as well as the usual apple and willow twigs), as long as the area hasn’t been sprayed with any chemicals.
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.