Hi Hunter, All pet shops aren't the same. The problem is they often have a set up, either tanks or other vivariums in racks that amount to no more than heat produced by an incandescent bulb. On the other hand, I've been in pet shops that have specific setups for reptiles needing belly heat, higher temps, or more humidity. Personally, I may never buy a corn snake from a pet shop, but I know some awesome morphs were reportedly found in a pet shop, such as the charcoal.
Regarding rheostats, they are nothing more than adjustable resistors to control the current going to a device. I've bought a couple over the years, and made my own using a fan control rheostat from Home Depot mounted into a plastic electrical receptacle. If you are referring to temperature control devices, that's another story. They are more pricey than a simple rheostat. But I did buy an Inkbird 306T recently for a new rack I built, that was only $30 shipped. So far it has been very accurate. I don't fully trust any electrical devices, so have digital thermometers with alarm modes to alert me to any problems.
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