Cheapest it's been (according to the camels) even though it's only for the blue version.
About this item
200-8000 dpi laser sensor
1000Hz Ultrapolling and light sync rgb lighting
Works with Windows, macOS, and Chrome OS
Six programmable buttons and 1ms response time
6.89 inch wired USB connection
Included components: 1 x logitech g g203 lightsync mouse, blue
I think it's been this price for ages on Logitech's eBay store. If you are an eBay Plus member and have vouchers you can get it cheaper here.
Edit: Also have a 4 item bulk buy for $75 if you need more or want to split it.