Amazon with BESBUY DIRECT has the FOLIV 205-Piece Flat Head Threaded Rivet Nuts Assortment Kit (M3, M4, M5, M6, M8, M10) for $24.99 - 50% off with coupon code 7YXCB9HV [Exp 5/30] = $12.49 with free shipping on $25+ or with Prime.