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Amazon has Solid Duvet Cover Set (Twin,Full/Queen,King) in 6 colors on sale for only $ 9.99-$ 14.99 with promo code TUEP3SUB. (50% off) Shipping is free with prime or order $ 25+

After code TUEP3SUB price:

Twin size for $ 9.99
https://www.amazon.com/dp/B071DCCY7B/

Full/Queen size for $ 13.49
https://www.amazon.com/dp/B071J17YZJ/

King size for $ 14.99
https://www.amazon.com/dp/B071LLXRCL/