locking lid for a 20 gal long

[mle421]

This actually doesn't pertain to fish, but I cant find a locking lid for my 20 Gal tank which houses my hamster. She's chewed threw 2 metal wire mesh lids now. I walked into my bedroom last night to find her just sitting on my floor, like, "look at me! i've escaped again!" So if anyone knows where i can get a lid she cant chew threw, it would be greatly appreciated!!!!!!!!!!! I know i can always count on my Aquarium advice friends! TIA!
~emily~

 

[Hara]

glass or thick plexiglass with small airholes drilled in, velcro'd down snugly.