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Cheapest I could find on eBay was $13
Select Priority Line Shipping 7-15 Business Days for cheapest shipping option.
Description taken from GearBest
Description:
1. Grip does the work of many tools, sets of sockets, standard and locking pliers, and an entire range of open end wrenches. The ingenious Grip makes half of your toolbox obsolete! It fits virtually anything. The one socket fits fasteners of almost any shape - square, hex, wing nuts, cup hooks, eye screws and even broken, stripped and rusted nuts other wrenches can't move.
2. No more reaching into your tool box, grabbing socket after socket until you find one that fits. The Grip instantly conforms and locks onto any shape nut, bolt or fastener.It won't slip off nuts or strip them. With Grip, you get the job done fast with no hassle and little effort.
3. The revolutionary socket design automatically adjusts to fit any nut or bolt from 1 / 4 inches to 3 / 4 inches , 7-19 mm! Works great on metric, standard, wing nuts, broken nuts, stripped nuts, eye bolts, square nuts, hexes and more! Save Time! Save Work!
Main Features:
Material: Stainless steel
Handle length: 17.7cm / 6.9 inches
Drill adapter length: 4.9cm / 1.9 inches
Socket dimension: 52 x 26mm / 2.0 x 1.0 inches (H x D)
Quantity of steel rods: 54
Max depth: 3 / 8 inches
Standard driver: 3 / 8 inches
Socket type: Universal 6-Point
Comes up as US$3.99 for me