There are so many factors to consider and hopefully you’ll get a lot of good advice. My advice would be to read everything on this site and learn all this stuff for yourself.
But to give you a simple answer, I’d say the quickest, cleanest way would be to buy from Apache Poker Chips - they, and Spinettis, are the only reputable retailers that I can think of, who can sell you a set of Paulsons. Everything else is member to member or
eBay. But yeah, quick answer, Apache can sell you 500 chips for $750 - they are casino used, but not horribly so, and for a buck-fifty a chip, it’s a fair market price.
https://www.apachepokerchips.com/product/500-jumers-casino-paulson-poker-chips/