What about the SORD military free fall rig? Only $43 AUD plus s&h. 8 PALS channels, 3 rows. Would be good for 2 x triple pouches and a side-arm holster or 3 x triples for a total of 9 M4 mags.
http://www.sordaustralia.com/mffrig.htm
EDIT: on sale right now for $35 AUD