• Chic sandal brand Marais USA is holding a one-day pop-up shop in Williamsburg, offering the Crosby, Mott, and Prince styles. 55 Nassau Ave., at Guernsey (718-782-3075); 129.
• For one day, adult and kids' solid flip-flops at Old Navy are $1. Various locations.
• Opening Ceremony is offering up to 50 percent off clothing from brands like Vena Cava, Boy, and the in-house Opening Ceremony line. Until merchandise runs out. 35 Howard St., nr. Broadway (212-219-2688); M–S (118); S (127).
• Find discounts of up to 40 percent on clothing from Wren, Trovata, Jamison, and Lorick at Thistle & Clover's spring sale. Wren's classic navy trench is $271 (originally $387) and Demylee's lush striped cardigan is $229 (originally $345). Through 5/24. 221 DeKalb Ave., nr. Clermont Ave. (718-855-5577); F (128); SSu (117).
• Gargyle is offering up to 40 percent off spring and summer clothing from Lorick, Surface to Air, Rachel Comey, Acne, and more in-store and online. 16A Orchard St., nr. Hester St. (917-470-9367); daily (107:30).
• Araks lingerie, fall ready-to-wear, and swimwear are up to 80 percent off; a chemise is now $90 (originally $275), a swim set is now $40 (originally $228), and find $10 bins of bras, panties, and more. 137 Grand St., nr. Lafayette St., fifth fl.; Th (8:307:30), F (9:306:30).
• Luca Luca cocktail dresses are up to 90 percent off. 19 W. 36th St., nr. Fifth Ave. (212-644-5568); daily (96).
• Save 75 percent on the MINT Jodi Arnold spring collection, a great sale to hit if you need something to wear to a summer wedding. Pants start at $80 (originally $200), tops start at $120 (originally $300), and dresses start at $160 (originally $375). 230 W. 39th St., nr. Seventh Ave., second fl.; daily (96).
• At the Nanette Lepore sample sale, dresses are $140 (originally $335), skirts are $100 (originally $195), tops are $95 (originally $215), sweaters are $75 (originally $110), and shoes are $130 (originally $255). 225 W. 35th St., nr. Seventh Ave., fourth fl. (212-594-0012); daily (97).
• Clothing from Vivienne Westwood Anglomania, Ilaria Nistri, Iodice, and Qi is 70 percent off at this sample sale. 544 W. 27th St., nr. Eleventh Ave., sixth fl.; TF (108).
• Clothing and accessories by Orla Kiely, Charlotte Ronson, and Erickson Beamon are below wholesale prices at Showroom Seven. 263 Eleventh Ave., nr. 27th St., third fl. (212-643-4810); MS (107), Su (closed).