While these can be found on the market, good models with adjustable heat may cost over 30 euros. By analysing the kind of hardware I would need, I found that it wouldn't be such a big problem because I already had most of the stuff in my electronics scrap containers.
The only thing I didn't had laying around was the support for the hot wire, which I had to buy. I just used a metal support with a wooden holder for a conventional saw, which proved to serve the purpose just fine:
