Walmart has a high value coupon for $2/1 Goodnight Disposable Mats with NO size restrictions! Use this coupon at Walmart to get a little overage on the trial packs.
GoodNites Disposable Bed Mats 1-count Trial Pack – $1.47
(Look for these hanging near the diaper/baby section)
$2/1 Goodnights Mats coupon
Final Price: FREE + $0.53 in overage!