Amazon has the Refurbished Makita 9557NB 4-1/2 inch Angle Grinder, 10000 RPM, 7.5 Amps for $35 plus $10 shipping.
Technical Details:
* Protective zig-zig varnish seals motor from contaminants by forming a barrier under rotation
* 7.5 Amp motor design for high output power in a more compact tool (only 3.5 lbs.)
* Thicker coil wires are wound more closely to reduce heat and energy loss
* All ball bearing design and metal gear housing for durability
* Rotatable gear housing rotates 90 for cutting applications
Amazon.com: Makita 9557NB Factory Reconditioned 4-1/2 inch Angle Grinder, 10000 RPM, 7.5 Amps: Home Improvement
Makita 9557NB 4-1/2 inch Angle Grinder, 10000 RPM, 7.5 Amps (Refurb) $45 Shipped 
