Trove of Goods via Amazon offers Prime members the Dewalt 4.5" High-Performance Metal Cutting Wheel
, model no. DW8424H, for $3.99
with free shipping
. (Non-members can spend $25 or more to qualify for free shipping; otherwise, shipping costs $5.74.) That's the lowest total price we could find by $2. It features a plastic attachment flange and a maximum rpm of 13,300.
Amazon Prime membership is $79 per year; however, Prime is free for college students for six months, and free for parents and caregivers for three months.