We just got home from town and I was coming to post this deal!
I, too, was expecting it to be about $25 - TRU had Incredibles advertised at $29.99 and Cars at $24.99, and I deducted the $10 for buying both plus my $18 in coupons = $27, which I would have been happy with.
Then, when I actually bought them, my total was $16.15 - here's how my receipt broke down:
Cars Combo: $29.99 - $12.00 (BOGO 40% off) - $3.40 (Cars promo?) - $5.00 ($10 off purchase when you buy both) = $9.59
Incredibles 4 disk: $34.99 - $6.60 (Cars promo) - $5.00 ($10 off when you buy both) = $23.39
Coupon - $10
Coupon - $8
Tax = $1.17
TOTAL = $16.15
My cashier was shocked and I was thrilled - he wanted to know where I got my coupons.

FWIW, there were NO signs in store regarding the $10 off when you buy both, I just knew about it. AND, both movies were marked full price (Cars at 29.99 and Incredibles at 34.99, but they rang up correctly based on the ad). I was surprised it stacked with the B1G1 40% off, but I'm glad it did! That made the difference between what I expected to pay and what I actually paid!