Baja Fresh has two great coupons for you to print Here.  They are:

$2 off $7 purchase
$5 off $15 purchase

Both expires 9/12.

Rubio's has two coupons Here that is good for the following:

15% off catering
Buy a burrito, 2 taco plate or a entree salad and get one free
One expires 9/19 and the other is good 9/4-6.

Enjoy