I don't have a yogurt maker. You don't need one. If you have a cardboard box and a couple of towels, you have a yogurt maker. I make yogurt in canning jars, but any jar will do. I like glass jars because they don't react with food. Oh, if the jar had a metal lid, don't use that; cover with a paper towel secured by a rubber band.
Here's what I do:
Line the cardboard box with one of the towels.
Put your starter culture (some yogurt) into a bowl.
Heat the milk to 180-185 F. Cool to 120 F. Pour the milk into quart canning jars, saving about a half cup, which I pour into the bowl with the starter. Mix that well, and pour the mixture into the quart jars. Stir milk/starter in the jars. Cover the jars, put them in the box, cover with the other towel, and let it sit for 6-8 hours.
Voila! Yogurt.
More notes on what I do:
I make a gallon at a time. A 6 oz container of plain yogurt is enough to culture a gallon. I use 5* quart jars, and cover with plastic caps. After 6-8 hours, I drain it using nylon mesh bags like what you can buy to store vegetables in. (In fact, that's what they are.) I drain it for about an hour, saving the whey. I dump the now-really-thick yogurt into a large bowl and mix in some honey. Save some of the yogurt before you put in the honey for your next batch of yogurt. (Honey doesn't mix very well into cold things, so I do it while the yogurt is still warm.) Store in glass jars in the fridge.
* I need 5 quart jars to make a gallon, because the volume of a canning jar is a quart all the way up to the rim, leaving no room for starter or stirring, or trying to move the jar without spilling.