Gonna +1 the first guy's suggestion. Amazon has a lot of really nice ones for pretty good prices. eBay and Cozycatfurniture are also good choices.
I saw this one on Craigslist if you want to look into that. https://batonrouge.craigslist.org/for/d/erwinville-7-foot-cat-tower-beige-mint/6870827590.html
Sure thing! This is the exact tree: https://www.amazon.com/dp/B078RN3215/ref=cm_sw_r_cp_apa_i_M.54EbMK5SSCQ
Doubles as a scratching post and verifiable kitty mansion (I probably spoil them too much)... It's held up pretty well for me except the time he went ham and decided one of the dangling jingly bells was his arch nemesis. That got torn off and shredded on like day 3 (you can see his handiwork in the photo. Bastard.)
Edit: I paid ~$50 for it on Amazon in 2020, but I guess since then it's climbed to $95 as of 2021. no idea why it climbed so much for the same or worse quality, but it's probably not worth it anymore - do your own research if you can ❤️