Dick’s Sporting Goods has 20% off any one item, which makes Powerblock Elite 50lbs set for $239.99 + tax. Free S/H. Should be applicable to expansions too.
Price reduced in the cart, not on the item page. Expires 4/30/2018 11.59 PM PST.
It’s not as low as cyber monday, but I had trouble finding any kind of sale in a long while.
https://www.dickssporti