Pikler triangle! I got one on amazon that was a whole set for $150 but you can probably find on marketplace for cheap
Agree with a pikler triangle set, my son loves it. We got ours on Facebook marketplace to save some money.
Have seen some deals today for some $65-99 on Amazon, and a lot in the 130-160 range
There are also some prime day deals on soft play sets but I think you’ll get much more use out of a pikler triangle for the next few years
Lots of prime day deals on pikler triangles!