CCSpecialty is the biggest supplier of 2stroke porting & polishing equipment.
They have everything related to engine porting, from hang-up motors and handpieces to carbide cutters and abrasives. If they don't have the proper porting tool for you, chances are you don't need it! Especially the #1MC right angle handpiece is the most recognizable porting tool among two stroke tuners.
Don't forget to check their links for quite a few interesting 2stroke related stuff ...here.