When can I do another co-op map?

The 1st one was pretty cool and everything but when do new ones start showing up. I'm in the 200s now.

EGO 300, then two at 400.

New maps available at 150 - 250 - 400 - 450 - 500 EGO. Cronkhite bunker available after finishing Sausalito storyline quests.

Thank you for the answers.