Just wanted to make sure you know that the link you provided is for an ESEE-5 without a sheath or clip and is "Knife Only". Here's how the part number breaks down:
ES5(ESEE-5)S(Serrated)KO(Knife Only)BK(Black)
If you plan on getting custom Kydex made than you're saving some money but otherwise you'll be spending more than what you're saving to be able to carry the knife. Hope this helps.
Eli