Cost per roll with the Tetenal kit is about $1/roll with C-41 and $2/roll for E6 with the 5L kits. With neg film, if you are shooting 24 exposure rolls, even more. Ditch the local slop lab, try it, you will never turn back!
Also, with the Tetenal kit, you get enough stabilizer and dont have to worry about checking the chems to see if they have gone bad. Quality control is very high, so that you dont have to worry about these things. The kit is reliable, and just works. No caveats.