I have no connection to Microkerf in Leicester but they are a cut above the half dozen laser cutting companies I have used previously. (Unintentional, but not a bad pun!)
If you have a DXF file (or files) it creates a detailed quotation online in seconds, not only does it give a the price for the part but also calculates prices for the 5 off, 10 off, and however many cut out of a full sheet!. Its also only a few seconds work to compare the cost differences of making the part out of different grades of material.
I would say they are extremely model engineer friendly as although they are a big company they have really automated their system and it works. They do have a minimum charge (not sure how much) but the service is truly excellent. (Microkerf.com)
Ian P