Here is a link to the Target price match policy:
http://pressroom.target.com/pr/news/value/our-low-price-promise-facts.aspx
From what I've read, the best deal is to price match Best Buy's price at Target and use the 3 coupons to get Up and MI for $10.98.
Up - $19.99 (sale price)
MI - $18.99 (price match)
-$10 Up
-8 MI
-$10 Target coupon for buying both
$10.98
Some that did not PM were able to use the peelie that comes on MI when they purchased any other item (so you are purchasing 4 items), but YRMV.
Up- $19.99
MI- $26.99
-$10 Target coupon for buying both
-$10 Up
-$10 peelie from movie for buying both
-8 MI
$8.98