Ranphykx via Amazon offers its Ranphykx 65-Piece Magnetic Building Blocks Set for $21.99. Coupon code "PDAUDDJY" drops it to $17.24. With free shipping for Prime members, that's tied with our mention from a month ago and the lowest we've seen. (It's the best today by $8.) It features 65 magnetic pieces made from ABS food grade plastic. Deal ends August 13.