Contact Tom Heller (Lugerdoc) in the For Sale forum... he stocks the mags and his price is competitive... You can also find them on ebay from time to time... Blued is good, but I find the plated ones to work a little better...
I wish someone would start making them with teflon coating inside and out... that would be slick! (pun intended!)
You can load a full mag without a tool if you have strong hands, but I recommend you use a loading tool... it will make your thumb ache a whole lot less.