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Amazon [amazon.com] has 10-Count 0.4-Oz Winsor & Newton Gouache Paint Set for $ 19.99 – $ 8 when you ‘clip’ the coupon on product page = $ 12. Shipping is free with Prime or on $ 35+ orders.

Price:
$ 10.15 lower (46% savings) than the list price of $ 22.15
$ 8 lower (40% savings) than the previous price of $ 20