I found the barrel of monkeys at Walmart.
Be glad your gliders only chew rubber. Ours chew skin-ears, neck, arms mainly, but they also like heads. We try wearing hats, headphones, long sleeves and nothing really helps. Long sleeves do though.
The only thing we've been able to figure out is they are bored. Playtime in the bathroom is when they chew, and the options for changing everything around are limited unlike their cage. When we (occasionally) have taken them out in the living room with a completely unknown and strange (to them) set of thiings to explore, they don't do any biting at all. They climb on the blinds, the tall bookcase, the door jam and have a great time doing it and jumping between us, around on things. It's still strange enough that they don't venture off us for long.
I have been unable to find the baby keys anywhere. I tried Target, Walmart, Amazon, and I tried the online version of all of those. I buy little rings, little halloween rings or bracelets, little plastic pumpkin cupcake things and they all seem to like them, but where to do it in the bathroo?
I'm baffled.