Adorama now has available a Hot Shoe to 3.5mm Mini Plug with a 12" cord. This is a perfect connector for speedlites that do not have a PC connection such as the older Canon TTL flash units when you want to attach it to a "Pocket Wizard".
Please note that the hot shoe portion has dummy plugs that allow the multi pins of TTL flash units to slide on and off the shoe properly.
These are not "TTL" connections. The Hot Shoe is complete with a locking knob and a female 1/4-20 thread on the bottom of the shoe.