On Amazon right now you can get these handy 2pc Car Head Rest Hanger Hooks for Grocery Bags, Purse, Gym Bag for only $6.54! I think these would be awesome to have in my van.
These will ship free with Amazon Prime or qualify for free Super Saver Shipping with a $49 purchase.
Note: Amazon prices and promotions can change at any time. The price(s) listed in this post is/are subject to change.