LightInTheBox offers this 10-Piece Executive Toys Puzzle Cube for $6.92. Coupon code "TOY2102697" drops it to $3.92. Plus, select no tracking to bag free shipping. That's $4 under our mention from last September, $16 off list, and the lowest total price we've seen. It features 10 bendable magnets.
Note: Uncheck "Add shipping insurance" to avoid the 49-cent fee.