Direct Tools Outlet [directtoolsoutlet.com]
has RIDGID OCTANE 18 Volt Brushless 4-1/2 In. Angle Grinder, R86042B (Factory Blemished, Bare Tool) on sale for $59.99 + $7 shipping (or free store pickup). Tool is Factory Blemished, meaning it is eligible for the Lifetime Service Agreement.
Going to say it again, because someone is going to ask in the comments. ELIGIBLE FOR THE LIFETIME SERVICE AGREEMENT.
The tool retails new at Home Depot [homedepot.com]
for $119, where it has 384 reviews and 4.4/5 stars.
Tool is also recommended by Pro Tool Reviews [protoolreviews.com]
, who rated it 9.2/10:
The Ridgid Octane 4-1/2-inch grinder has the power to be the primary small angle grinder for Pros that don't need the runtime of corded tools and a supplementary grinder for those that do.