SIM adapter that works with Galaxy Nexus?

Hey guys,

Purchased a Nexus 4, with the intention to pop the SIM card out of my Nexus 4 and put it in my older Galaxy Nexus, so that I'd actually have a working phone while screwing around with custom roms, or whatever. To my dismay, only when I got the Nexus 4 did I realize that it had a micro SIM slot... guess I should've researched that one more carefully :)

Anyway, for those of you who have both of these phones, can you recommend a SIM/micro SIM adapter that you have successfully used for this purpose? I saw some of these on Amazon, and reviews seem to be all over the place, with some people saying they work and some saying they don't. I went to the AT&T store (which cut the SIM card I was using and made it a micro SIM) to see if they had one, but they didn't.

The Tmo store I went to had a micro sim to sim adapter for only about $6. I plan to keep my old razr flip as a backup. I haven't tried it yet, but assume I get a warranty with a Tmo store.