I just bought it from this guy on ebay
This is the description
THIS M2 HIGH SPEED #2 BALL JOINT & TIE ROD TAPER REAMER IS BRAND NEW AND MADE IN THE USA BY XKUT. 1 1/2" TAPER PER FOOT FOR MOST BALL JOINTS AND TIE RODS. OVERALL LENGTH IS 6 1/2". FLUTE LENGTH IS 4 1/2". LARGE DIAMETER IS 1". SMALL DIAMETER IS 7/16". SHANK DIAMETER IS 1/2". REAMER HAS 6 FLUTES. THIS TOOL CAN BE USED BY HAND WITH A TAP WRENCH OR IN A DRILL PRESS WITH A 1/2" CHUCK. MULTIPLE BIDS OF SAME OR DIFFERENT SIZES GET A FLAT FEE OF $3.85 USPS PRIORITY SHIPPING. SEE MY EBAY STORE FOR MORE TAPER REAMERS AND SETS.
Payed under $40 with shipping.
I also read and heard in my searching that SOME "bridge" or "car" (railroad) reamers will work but I didn't want to mess with it over a few $$$.