Kmart offers the Disney Dory Fleece Throw, model no. 1DIS/032, for $5.99. Plus, Shop Your Way Rewards members bag around $5 in SYWR Points. (Not a member? It's free to join.) Choose in-store pickup to avoid the $7.49 shipping fee. Assuming you'll use the credit, that's $6 off list and the lowest price we could find. It measures 40" x 50".
Of note, Shop Your Way Rewards members will earn a Kmart credit with this purchase and may be eligible for additional credits and discounts.