Computer Surgeons has the Recovery Kit for a small fee. It is only WinXP SP1, however. As far as I know, HP does not provide any downloads for any Windows OS's, so you are at the user's discretion on where to get old OS's. WinXP also has some different variations for the supposedly same version as OEM is different from retail. I would assume most of the downloads you actually find will be retail.
I used to have a Compaq reinstall WinXP and it was only the OS and installed fine as a OEM reinstall but do not remember what SP were included. IMHO. You might be better off getting an old disk from EBay if you really want WinXP SP3
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