Rasmus SA5RJS on Nostr: I bought this one: There are plenty of sellers that sell the same kit on AliExpress ...

I bought this one: https://www.aliexpress.com/item/1005005067657667.html

There are plenty of sellers that sell the same kit on AliExpress and Ebay. There is a 100 W variant too that has one of those white double transistors instead of the two IRF530 transistors.

Note that the one I linked does not come with a heatsink, but I think there are others that have that included.