Cimorene

I have never yet bought beeswax as marketed for sewing purposes; I bought single bits of nicely molded beeswax from artisanal candle makers stands at crafts fair though (in the summer, might you, except for the ones I bought at Strasbourg's Xmas market). I'm not saying it'd be easy to find any time or any place, of course, but that might be an option for you? They work just fine for my sewing, so far.