Bryce 7 is still sold as usual on daz3d website. It goes on sale with discount often.
As much as you can dislike/hate daz3d themselfs (btw i think they gave up on nft stuff... idk... overall it looks like poser/daz market is struggling anyway), keep in mind that daz forum's bryce section is one of most welcoming and warm bryce-related places. Even if you just use bryce4 from archive or ebay or whatever, you can go there and ask questions in case you need help - those people are great. Especially David Brinnen and Horo, whom you might know for amazing tutorials on youtube.