Scribus Friendly Print Shops

Here you can recommend and shortly describe a print shop that has proved to be reliable and Scribus/PDF Friendly.

Please provide a short description of the printer and what they do (sheetfed, litho offset, etc). In particular, if you can find a link to their specifications, please provide it here. It would also be extremely useful to know if they accept PDF/X-3 jobs, CMYK jobs, or both.

The official Scribus documentation, maintained on docs.scribus.net, already includes some Scribus friendly printers.