Right now you can head over to Chacos.com and get select Chaco Chillos Slides and Flip Sandals for just $20 shipped when you use the promo code CHILLOSDEAL at checkout.
I tried it on a few pairs listed as $29.99 and it worked but it did not work on EVERY color so you may have to add some to cart and then see what works.
I checked this code at 7:43 a.m. EST on 6/24 and it worked!