Right now, JCPenney has the Pyrex 18-Piece Storage Set on sale for $34.99.

Use promo code 7BIGSALE (15% off) and submit for a $15 mail-in rebate form to pay just $14.74! Note that the rebate is valid through today 8/8 only. Shipping is FREE on orders of $99 and more, or opt for FREE Pickup if available. Get it here!

Buy Pyrex 18-Piece Storage Set $34.99 (Reg $78)
Use promo code 7BIGSALE (15% off, x9/3)
Pay $29.74
Submit for $15 mail-in rebate (limit 1, x8/8)
Final Price: $14.74