All you need is a shitty old iron for waxing, gummy stone, a sharp file, and an edge bevel clamp to hold the file. I freehand the base bevel. The kits are usually pretty expensive for what they are.
If all you're doing is waxing, I'd just buy an iron and scraper and one or two temperature waxes. If cross-country skiing, it's worth it to get more elaborate, but AT doesn't require much attention to detail.
