Sears.com has the PowerBlock Sport 90 Stage 1 Set 5-50 lbs dumbbells for $259.99 plus you'll earn 37,600 Shop Your Way Points worth $37.60 for a later purchase. Add the dumbbells to your shopping cart, which will reduce the $299.99 face price by $15 to $284.99. Then click "apply my Shop Your Way coupons" and use the $25 off $200 coupon for an additional $25 off, making it $259.99. If you don't see the coupon, you'll need to add it from the Deal Center.
They are currently out of stock for shipping but you can do local in store pickup where available.