Texas Electrolysis Supply is legitimate. They are having trouble with their phone system right now so are asking people to call their local number not the 800 number.
Dectro and Silouette Tone both require your electrologist certificate as best I know. Dectro may not care, but they still ask for quite a bit for used machines. In the " a few hundred bucks " range the only places you find them are kijiji or the odd time craigslist or ebay. The problem I see with ebay, its a sellers market and machines get bid up to crazy prices.
The downfall for kijiji is severalfold. First, it's designed to facilitate face to face transactions. There is no opportunity for you to inspect the property if you are having someone ship something and no guarantees on the product if it doesnt work correctly. While it is possible to interact with sellers in other provinces and have them mail you the goods, this also leaves you open to various scams that can take place on kijiji. In short if you send money somewhere there is no guarantee you will recieve something useful to you in return. So while it's possible to email ( in french) someone in quebec to buy a machine from them and have it shipped to you, it's unlikely they are going to take anything non-guaranteed for payment, no credit cards, cash, or certified money order , and even then, you could end up with someones broken crap.
Electrology isnt a big enough medium to have a glut of available machines ( that someone paid several thousand dollars for at some point) that there are any dealers in used machines here in canada.
You're correct there is nothing listed in BC, but I did find this ST250 in calgary which moght be helpful for you:https://www.kijiji.ca/v-electronics/calg...gationFlag=true