The pricing structure is a little weird, reading this kinda raises an eyebrow... the prices quoted definitely have very little to do with the comparative amounts of work usually needed for each step. A mastering engineer will usually take between 30 and 45 minutes for a track. Possibly less if the mix is superb. A mix usually takes between 4 hours and 2 days.
I would ask your guy how that pricing structure comes to be. Also, I would personally suggest to not have the same guy mix and master, but that's very debatable (as seen in another recent thread). If you want to go ahead with your guy, make him give you some mixing and some mastering examples he did. They don't have to be exactly your style, it's just to see that he's at the level of competence you are looking for. 100 bucks for a mix is very, very cheap, so if you like the mixes the guy has done, that is a killer offer. 100 bucks for a mastering is average.
Originally Posted by jdg
maybe he meant stem mastering?
Good call, that would explain the offer...