The big-box retailer is selling a shopper-favorite and timeless Pyrex 8-Piece Glass Sculpted Mixing Bowl Set for a steal of a deal — just $19.99 for Costco members who shop the product online.

Pyrex dishes are fetching big bucks as dealers make rare finds they call the "holy grail" and snap up nostalgic kitchen pieces as seen in their favorite Netflix shows.

This sturdy, nesting set of mixing bowls inspired the next four decades of bold, bright colors — and more than enough promotional and customized sets.

Friendship design Pyrex mixing bowls and a Pyrex clear measuring cup. - Noderog/Getty Images Pyrex made its dazzling debut in American kitchens over a century ago.

Q: Two of my Pyrex mixing bowls -- one milk glass, the other clear -- are stuck together, and nothing I do will separate them. How can I separate them without breaking one or both? A: Ah yes ...

This sturdy, nesting set of mixing bowls inspired the next four decades of bold, bright colors — and more than enough promotional and customized sets.

This sturdy, nesting set of mixing bowls inspired the next four decades of bold, bright colors — and more than enough promotional and customized sets.