-RegF

If you only want a few then it might be worth investing in a CD writer and making your own CDs as and when you need them. Note that some cr***y old CD ROM drives can't read these kind of discs though - although these days that's probably only going to affect the one I fitted in my Dad's machine

Or make a deal with someone else who produces RISC OS CDs and see if they can handle it all for you (such as Datafile PD IIRC) ?