This week (Monday – Friday, Feb. 11th – 14th),
you can get $1 Jamba Juice smoothies from 9am – 11am.
No coupon is needed to get the 16 oz size for this price, but note the time.
It looks like, in AZ, it's only the Phoenix area.
Here's a link to a list of participating locations.
My kids love Jamba Juice! (Thanks, Frances!)