For a set of six, it will cost you around $300 - $400. TireMinder is a little more expensive, but it comes with a repeater booster. A repeater/booster is around $60 for other systems.
EEZRV has a six-sensor set on sale for $289 at the moment.
We have TST. I'd likely buy a different brand if I needed a new system.
It doesn't so much matter which brand you get - just get one and know its capabilities, limits and problems. (<--------the last word is added in honor of RJsfishin :) )
That said, a vendor/reseller will likely try to contact you via PM to sell you a set.