At least where I live (germany), real mephedrone is next to impossible to get. I have some connects, if I want I can get my hands on reasonable quality coke, meth, heroin, LSD, MDMA in crystal form, good MDMA pills, speed, you name it. Just about any of the major drugs. But mephedrone? No fucking chance. I know a couple guys who sell 'mephedrone' to naive/uninformed people and in reality they are selling 3-MMC or other easily obtainable cathinone. It is mind boggling if you ask me, mephedrone became one of the worlds most popular drugs but once they banned it, it just disappeared. Every reasonably sized city (sometimes even villages lol) in the world has its own meth lab(s), yet finding ACTUAL 4-MMC is almost harder than getting pure cocaine. What the fuck, it can't be that hard to synthesize!?
It's not even possible to buy it via the
unnamed online drug marketplace; while there are many dealers naming their product mephedrone, after reading through user feedback and watching photos of the crystals you find out it's some other cathinone in all cases. Also the price tends to be suspicously low for an illegal powerful stimulant.
No other cathinone comes even close to preban mephedrone euphoric effects. If you truly have 4-MMC, congratulations, this is a rare thing. Even on this forum, where most users are much better informed than average drug user (who doesn't read about drugs at all and cares not about long term effects etc.) most people contributing to meph threads obviously don't get real 4-MMC, instead they get some other overpriced shit bought off the internet. I heard in the UK and Netherlands it's easier to find real 4-MMC and these are exceptions.
Now to your question

: If you want to avoid compulsive redosing and feel fine the next day, just swallow it. The actual effects are basically the same, if you snort it you get a powerful rush which feels greart but lasts few minutes and after that the high is the same as when swallowed. Redosing generally works quite well with mephedrone but it all depends on the person. Generally stopping at 0.5grams in a night would be ok.