Logitech Announces The Successor To The MX518/G400S/G402 | NeoGAF
I found the spiritual predecessor to the g502, the g9x, while I was thrifting. Yes it has the frictionless scroll wheel as well. Interesting to see how mice have evolved over time. :
Oldie but a Goldie | Logitech G9X : r/MouseReview
Logitech G9x for sale | eBay
Amazon.com: Sanpyl USB Mouse Cable for G9/G9X Game Mouse,Replacement Mouse Line Repair Accessory : Video Games