How can I fix a memory issue with MarketPress with over 500 products?

I have this site that has all the NFL teams, all the NCAA teams and MLB teams. However, when I am importing the products for the NCAA teams (about 30 products per team), I get a Fatal error “out of memory”. I edited the WP-Config file and put it to 768M for memory limit but no go. Should I increase it more? Or should I edit the PHP load server-side? Thanks!