The ones I have are the standard nylon open type (no flap) that come with the purchase of a mini maglite. Personally I see no need for a button flap unless you want to conceal it or plan on standing on your head and don't want to risk loosing your Tornado/eGo while inverted.
I see the one you're referring to though. For about $20 you can get the whole maglite kit belt pouch included. No REAL man should be without a maglite. The ladies are the better for it too. If they don't want the maglite their husbands/bf's should - especially if they want to be REAL men!
I may be wrong. It's happened a few times in the past. But I believe I've seen maglite belt pouches for sale seperately in places like construction suppliers, Home Depot, Lowes, etc.