Gold Coast Shooters supplies have KKK 10 rnd steel mags (7600/.308) for $70 each
Lucky 13 billet alloy 10 rnd mags (7600/.308) are about $180 each
Wild Dog mags seem to be even more expensive (I have heard of prices of $250 each) and so I never sort them out.
The KKK mags have a reputation for unreliability, yet I have 4 of them for my 7600 Police and never had a problem. The Lucky 13 mags are apparently very reliable, though they are very expensive. You can get your local gun smith to 'function test' magazines.
https://www.youtube.com/watch?v=zAM_IOrl1L4