Nesties Rectangles all 4 sets at Walmart
OK, I wish I'd gotten mine at this price, but just to be a good enabler- the set of all 4 Rectangles Nestabilities online at Walmart is only $35.
Spellbinders Nestabilities Die-Classic Rectangles: Crafts : Walmart.com
Hope this helps someone out!
Heading into retirement, and eager to get there!