Most if not all vendors who say they're selling 3-MMC these days are actually selling 2-MMC or another crappy cathinone (source: look at my post history, I've been searching for 10 months, ordered from a ton of vendors and every time I received crap). Supposedly /u/H2G2 might be able to get their hands on some and have gotten a sample from their supplier for testing, but the last update they gave was a month ago: /post/812ea365b3ccefdf3c9f/#c-c40d037fe9298e0695
I just ordered some from /u/maestrodutch , I will send it to be tested to the lab when it arrives and post it here, I haven't found any real 3-MMC in months, so I'm eager to check this one.