Walmart has Duncan Imperial and Butterfly Yo-Yos for $3, in-store purchase only.
Amazon has the Duncan Imperial Yo-Yo for $3. Shipping is free with Prime or $25+ orders. Colors may vary.
Amazon also has the Duncan Butterfly Yo-Yo for $3. Shipping is free with Prime or $25+ orders. Colors may vary.
Note: photo is for the Imperial model, so YMMV. Thanks to PlumLoco.