For anyone in the Midlands of England, I've been using LM Cutting Tools (based in Langley Mill, Nottinghamshire) for years. Their standard rate is 8 pence per tooth and they always come back razor-sharp. I have 36 saw blades ranging from a pile of 48T x 160mm crosscuts for the TS55, right through to half a dozen 96T x 305mm for the DeWalt 780 - plus a few other sizes and quantities in between. It's staggering how many you get through when you do this for a living. 

Another one for Leitz. We were using a local "saw & tool" company and had been for many years. They ran into a problem a few years ago of something similar to what RJneal mentioned, egg shaped. After we complained about it, they did fix the problem with the offending machine and even replaced a few blades, but when it started happening again? nope. We're out. Time to find someone new. It really sucked though, because they would take saw blades, router bits, Forstner bits, even holesaws and carried a lot of new ones right in his van. So you could get another one while the first one was gone. We always maintain spares, but occasionally some do need replacing or you need a new router bit or bearing. This was very handy and he came every week. The Leitz guy is not as comprehensive, but the sharpening is much better. Of course in recent years, the internet has brought quicker/easier ordering too.