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Second rec for WatchGuy that Reek recommended me; sent my watch in and they took it apart and told me it didn't need a service so put a new strap on at my request and sent it back, with very prompt updates the whole time. Got charged for them to open it up and measuring the bpm or whatever it is they do to see if it needs a service (they are up front about this), but it was good for me to know the watch can still keep going a while without a service so that was worth something to me.
I know I paid about £250 for my complete teardown and rebuild with progress pics and all - but that's clearly at the top end of the scale, and the watch I sent was absolutely battered, not even running. I'm sure a basic clean lube and service is much cheaper. There are definitely a few recommendations in this thread so well worth a search.