The best prices I have seen are at Best Buy and Target. Both places will have it for $15.99.
Here is a coupon for $5 off the movie on DVD.
Here is a coupon for $10 off the movie on Blu Ray.
There is also a $4 mail in rebate if you buy select SunMaid raisins (24 oz canister, 6 pack of 1.5 oz cartons, or 7 oz 14 mini boxes bag). You can download the form here.