I’ve got good no name mags from CDNN for a Mini 14 but factory mags are $45. Go with Magpul. They’re $10-12 at Midway. Also got Lancers at Midway for a good price but haven’t tried them yet.
Another vote for Magpul. I agree with Slim, it’s not a good place to economize.
best mags:
Magpul PMAG Gen3 MAG55557BLK or MAG556BLK
Brownells-part # 078-000-113WB
NHMTG MA02L (Brownell # 100-012-166WB
OKAY Industries USGI 30 round mag
I usually buy AR magazines from Magpul, but these other mags are less expensive.
I've dealt with CDNN for years. One of the quickest turnarounds for parts and magazines in the gun biz, and a flat-rate shipping charge of $9.99 for any amount of accessories to anywhere in the country.
My only gripe: since I pay by Postal Money Order rather than credit cards, I can't get all the way through their checkout shopping feature, and have to print out a separate sheet of customer name/address/phone/e.mail/customer # for them, and another page for the requested items. Big whoopin' deal.