My local FFL had some HKs for under $50. I'd still rather pimp out some USGI 30s with CS springs and magpul followiers at CMMG's website, but to each his own. lately, I've been spending my mag. money on good USGI 20s with alloy followers.
There are also some Aluminum "High Reliability Magazines" made by a US contractor (don't remember which one and too lazy to Google)...