Most stores will only have the "major" brands like the repti 500r which I do I have one. It doesnt indicate actual temp but a dial you can zero in on using a temp gun.
Your best bet would be to live with whatever thermostat you can find till you can go to a show or order. For value I like the hydrofarm because it has a digital temp indicator.
The probe showed go between the heat source and the mat. The thermostat plugs into the power source and the mat plugs into the thermostat. I like plugging in a power-strip to the thermostat.