200 lb for 75 bucks does sound way cheap, you wouldnt be able to get a quality mineral for even half that. id be a little concerned that its mostly salt as well, like the old saying goes, ya get what ya pay for. the one thing ive learned in the past couple of years is that there are many mineral companies out there (seems like a new one every day) but alot of them (not all) add alot of salt, yes the deer may love it but are they getting everything they need?
the next thing i would ask and i know this is early but do you plan on hunting over this site? 200 lbs should last you along time and if you add molasis or anything else it goes from a just a mineral to an attractant, illegal to hunt over or even be a short distance from in some states.