Apparently they're non-existent. I ask backline rental dudes about it all the time, and so far I haven't found a single one who's gotten a request for a micro amp, yet they sell like hotcakes and a lot of big names use and endorse them. You would think they'd get requests for as many as they sell, but the backline providers all say that everyone still wants tubes and/or solid state with iron transformers and nobody wants micros. I find that odd, and yet, even though I own and use micros, if someone else is bringing it, I want the tubes. What do you all think about that?