eBay - 80mm and 95mm (3 3/16" and 3 3/4" Forstner style bits (Rating: 5)

These huge Forstner style bits were bought on eBay from this company that I have bought numerous items from, tools and electronics. A cold rainy weekend would be ideal to go through all the unrelated interesting items that they have. The 80mm bit cost $A14.27 and the 95mm one $A18.37 including delivery.
As can be seen, these Tungsten tipped bits cut cleanly and there was no sign of eccentricity.
http://uxcell.com/