Right now on Amazon.com you can grab The Princess Bride for just $5.49 shipped free with Amazon Prime. Or, you can get it on Blu Ray for $11.99 here.
If you don't have Amazon Prime and would like to get the Blu Ray version in store for less than on Amazon, go here to print off a $3/1 coupon (Home Entertainment section). Walmart currently has this movie priced at $10, so just $7 after coupon - not a bad price for a Blu-Ray movie!
(Thanks, A Thrifty Mom!)