There are lots of recipes, you'll just have to use process of elimination to find one that's right for you. You can use actual menthol (sold in crystal or liquid form) or any of the myriad mint- and menthol-type flavor concentrates. Is it cheaper? Eventually, yes. Maybe not at first. Initial start-up costs might be a hundred or two for supplies and equipment, and you'll likely pour many ml's of failed recipes down the drain, but once you settle in and find a recipe that you like...well, I just mixed up a 120ml bottle for myself that cost me less than $6 in materials, and would be even cheaper than that if/when I start buying in true "bulk" quantities instead of buying flavor concentrates 8ml's at a time.. When I mix up a 10ml tester batch, the bottle itself costs me more (or would, if I didn't reuse them) than the liquid I put in it.