Here's a cheap one if you want to mail order it.
http://www.premiumaquatics.com/Merch...ct_Code=TM-GFI
Don't know what brand it is but looks the same as the 4275 model being sold for $18.95.
http://www.smarthome.com/4274.html
I'll see if Home Depot has it or if J&L can stock them. If not, anyone want to do a group order at Premium Aquatics?