Jayhawk, Innovative, and Turbo Grip all offer the services. I would also contact your local distributor they might have an instate company to do it for faster service.
I personally have a friend that works in a tool shop and is great. trade him a ball at cost and get my entire 41 pc set done plus 3 insert bits.
Occasionally you will need to have a drill bit re-tipped if it's blade is worn to the point it can't be sharpened. This is best done professionally.
Never take a file, rasp or grinder to a drill bit. your going to change the angle of the edge of the blade and reduce it's ability to differ heat.
If you have ever handled a hot drill bit you know it can get to a couple hundred degrees, and can leave a nasty burn if not careful.
I have 4 insert bits i rotate on a monthly basis.
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Timothy @Juniors Pro-Shops
LaSalle, Quebec
Located inside Pont Mercier Lanes.
Edmonton, Alberta.
Located inside Ed's Rec Room.(WEST ED MALL)
Roto-Grip Star Proshops
Etonic Stabilites Dress wearer.
Montreal, Quebec.