It depends on your use case…
If your use case is shooting pellets at typical pellet distances - say 60 yards and in - then you can get some excellent pellet guns for $350-$600, especially with after X-mas sales coming.
If your use case is shooting slugs at distances over 100 yards… well, I’d still suggest starting with pellets and 35 yards, lol. Over the next few years, there will be dedicated slug rifles with barrels designed specifically for slugs - they are already starting to appear. The tech will improve dramatically in the next 2-3 years, and the price/performance ratio will continue to improve.
I’ve got $2,000+ rifles and I’ve got one PCP that I spent $197 for (a .177 Gauntlet that shoots very accurately and has not leaked - ever). They all shoot damn accurately once you dial in a good pellet for the barrel and a good speed for the pellet - and that’s half the fun.
On these enthusiast forums, you always get the “extremists” - like the guys who spend hours trying to ”tune” their gun’s regulator so that they only have a 1fps spread over 50 shots, lol. And they will tell you that it’s necessary. Its like the guys on photography forums who constantly measure the resolution of lenses by taking pictures of test targets - they probably never actually get around to doing any real photography.
Bottom line, you don’t need a regulated, “high end” gun to shoot one hole groups with pellets at 40 yards... and a ”simpler” rifle that you can dissemble and troubleshoot easily is going to give you more time shooting and less time on these forums asking for help, lol.