Calibre can import and convert DRM-free MOBI ebooks. If a MOBI has DRM, this must first be removed using mobidedrm (note that this may not be legal where you live). As you say, a DRMed MOBI contains at least one PID and you need the PID to download the file and to strip the DRM. If you have a Windows PC, use the PID from Windows MobiPocket Reader. If you don't have a Windows PC, then borrow one just long enough to copy down its PID from Windows MobiPocket Reader (look under "Reading devices").
Once you have a PID, DRMed MOBI ebooks can be purchased and downloaded from any web browser.
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