I seen an earlier thread, but for what it's worth, I've had good luck with Burns Tools Sharpening. Good service, nice turn-around, etc. I go through a lot of 55 blades on the job, and I've been happy to be able to get some extra life from them.
I go to the local sharpener "Hans". He has served me well although I know if he promises to have it done on Wednesday it will be done the following Monday
His company is called Burnaby Saw. I don't know if he does mail order though. He charges $16 to $18 depending on how many teeth the blade has.
Sorry, still learning protocol. It's Burnstools.com.. $17.50 sharpening per blade,(for a 55) a bit more for my 12" saws. $4.50 to replace carbide tips. I generally ship (4) blades for about $8.00 each way from Chicago to MA. I go through about (1) 55 blade a week or two. I trim a lot of cabinet stiles and manage to hit a staple or two everytime. With most of the cabinets I install being painted, I need really sharp blades to avoid chips and burns.(no pun intended). I've had good luck. I keep an arsenal of about (12) blades, so I'm never short.