OP it sounds like you might have more saws than you need, so if money is an issue, sell a couple you use the least to help free up the $2k+ you’ll need to buy “legit” climbing gear.
Seriously, if you can afford $10k in saws and plan on taking them up in trees for fun, you would be a fool to buy anything but top tier climbing gear. The equipment has come further in the last decade than I can begin to explain, and the benefits of the new tech in terms of safety, comfort and efficiency are worth 10x the price difference over the outdated gear you’re thinking about buying.
Fatigue and poor work positioning (along with impatiently taking too large pieces at once) are the biggest avoidable causes of injury and death in the field - good gear and judgement will go a long way in helping keep you safe.
Get a modern saddle - sequoia, treemotion, monkey beaver, etc. - huge increase in comfort and mobility. Less consumable than most other gear and worth every penny.
At least two throwlines and bags.
At least two good 11.7mm static ropes - keep one reserved exclusively for pitchy conifers.
A good modern mechanical friction device like a zigzag, unicender akimbo, or rope runner pro.
A pinto pulley and several good friction hitches (I like epicord).
At least two good oval carabiners - DMM, rock exotica, or petzl.
Foot ascender and HAAS or SAKA knee ascender.
At least one good rope lanyard (recommend TriTech), two for sure if you’re going to buy spurs and plan on doing spar work. Skip the steel core flipline unless you’re going to be doing big conifer removals. 2-in-1 can be very versatile and cost efficient. ART positioner 2 and zillion are joys to use compared to other mechanical rope grabs.
On the subject of spurs, you won’t get a comfortable new pair under $350, and uncomfortable spurs are excruciating. Highly recommend Geckos.
You’ll need another grand or so for a proper rigging kit - at least two ropes, portawrap & big anchor sling, couple blocks/pulleys & ring slings, steel carabiners. The more slings the better.
It may seem like overkill for occasional use, but will give you the capability to actually tackle most jobs safely, assuming you are able to put together a sound plan of attack and have the skill to execute it.