When I was registering, a friend said her sister swore by vibrating teethers. I tried to find one at babies r us, but they were all dead - and the packaging said the battery wasn't replaceable. umm..okay then!

so I thought I'd order 1-2 from amazon (or elsewhere, if anyone knows where to find them?) but I'm nervous they will come and be dead.

did you buy one? was it worth it? WHERE did you get it??