Scarce.city and Plebian market https://plebeian.market/  are the only two I know of. Pleb market allows for selling your services as well. Just about anything for bitcoin really using lightning. It's a little glitchy at times but it will get better. The guys running it are awesome. Scarecity is cool too just a little different and more main stream right now. Pleb market is up and coming and getting better and better with time and development. But unless someone else can chime in. Those are the only two I'm aware of at the moment.

Search around. I think there  are probably folks on these forums that still have access to hundreds of sets. I used to sell complete sets for around $200 I think. While they are hard to find at decent prices, I think that people who have lots of them would say they’re difficult to sell. Putting up a WTB post might not be a bad idea. You never know who will see it.

In september 2023, 1st french crypto stamp will be available. Release planned feb 23 on Tezos blockchain, but posponed for unknon reason.
My guess : will be a mess if it is done the french way. C'est la vie!

Quote from https://github.com/PIVX-Project/PIVX/releases/tag/v5.5.0.

I'd like to voice my disappointment that such radical changes were made and not even mentioned here in advance. DNET/PIVX was announced/birth here and the dedicated forum was made several years later.

No self-respecting coin should be limited to their own censored/centralised forum. And without knowing anything about the "months of discussions", I do have to say these changes seem rather stupid and even insulting to long term holders.