It's been very windy here and I worry that my main dipole for 40m might come down so as a backup I recently purchased a 1:64 unun for an end fed antenna from AliExpress for AU$27. (The price varies a bit). I'm very happy with the quality and performance of it and can recommend this one.
Externally it's very solid and seems to be quite weatherproof and easy to hang.
From the seller's page, the internal construction seems good too.
I have it hanging on the wall of the shack with a thin wire running up in to a near by tree. This wire is very hard to see and would suit stations who wish to not attract attention.
Adjusting the length of the wire got it on to 40m very nicely.
Or via nanovna saver:
So SWR of 1.07 on 7.140Mhz looks very nice. Under 1.5 across the band. On air reports have been good. I haven't tried sustained 100W but I can believe SSB could be ok given the size. This design is described in various places and could easily be home built.
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