Recently bought an AGS WS-45 20Ah starter battery, filled at the shop with 1.20 SG electrolyte. Delivers approx. 190Wh of energy at 18W power draw, so 16Ah at 12V. It's not meant for cyclic usage, so that's fine.
Interestingly enough, I exchanged for scrap value two Volta sealed batteries. One was a 45Ah VRLA that had a shorted cell, and one was a 12Ah for a generator that was unusable because of a corroded positive terminal.
Please keep us posted on your search. I'm interested in buying some quality acid too.
I purchased a Daewoo DR60 for my vehicle in June 2022, although they allegedly have poor construction. Still functional, but I give it a stratifying charge every few months to make sure.