Are you asking about 45XX-series mags or 10XX-series mags?I can't find magazines anywhere. I know ProMag makes 4506 mags, are they any good? Are there any other magazines (Ruger) that could be reworked to fit?
Not too long ago one could still find the individual parts to assemble a 1006 magazine but unfortunately, Numrich sold out of the tubes.
4506 mags can always be found on ebay, but you'll pay for the privilege.
LOL! ... Ah yeah, no.I got my 645/4506 mags on eBay, but I got lucky and got mine with good "buy it now" prices. Expect to pay at least $50 for 645/4506 mags and $75+ for 1006 mags these days.
They are out there but you will have to search for them and when you find any be prepared to buy them, even if they might be a little more expensive then you would like.