OVERTURE 4KG Bundle Refill PETG 3D Printer Filament 1.75mm, 4 Pack 1kg(2.2lbs), Refilament for Bambu Lab Reusable Spool, Accuracy +/- 0.02 mm(Black+White+Red+Digital Blue)

I guess I'm way too late to the party, not seeing any individual 1kgs below $11. Best I could find just now is https://www.amazon.com/OVERTURE-Filament-Refilament-Reusable-Accuracy/dp/B0GMGR6XVC/ 4*1Kg for $34 ($8.50 ea)