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This "Amazon’s Choice" 10-piece stackable glass prep bowl set [amazon.com] is on sale for $ 15.87, matching its lowest price ever. Free shipping with Prime or $ 25 purchase.

This glass bowl set gets a 4.6 stars out of 5 average review score on Amazon.

Note: Amazon product page says "Usually ships within 1 to 2 months" so if you need these bowls yesterday, this isn’t the deal you’re looking for.

The SD effect is likely to happen. I doubt they will stay at this price for long.