You need to print to or export to pdf, with some qualifications, pdfs from Pages may have issues with transparency and resolution.
I don't know of any printers who use Pages as a core application, although in most cases it is the best method of output for Pages documents.
Ask around for Printers who use Macs and who may have Pages installed. It is not expensive, so even if they don't have it, you could offer to pay them for the DL and install, as a practical measure. It would only be a relatively small percentage extra on a reasonal print run.