GOGDB works but is missing some features like sorting games by new lowest price for example. Any better ones out there?

https://gg.deals/deals/gog-deals/

This one allows you to limit the search to historical lows, search by a minimum discount percentage and several other filters that may be of interest

https://isthereanydeal.com/

This one has better support for regional pricing. It can do cross store comparisons, but I typically limit it to GOG searches only. I've only used it to research individual games, not browse lists of games to find the best deals.

It's opposite in my experience. At least for PLN isthereanydeal shows prices that doesn't match at all to those on GOG or Steam. I suspect they only gather prices in default currency for region and use some common exchange rate to estimate others which is pointless (like Poland is in their EU2 region with default Euro).

gg.deals shows always actual prices in any currency and I like their interface better, just can't understand why they don't allow to choose only stores I want. There are not that many, so manually finding GOG is not hard, just needlessly tedious.