Give Ed a call. He's got a mould for the large square trigger guard models.
Rodek Leather Works, Inc. - Holsters
Cost is about $32. Same price regardless of color or finish. Delivery about 1 week.
Ed uses really heavy leather that holds its shape. He made this holster for my Glock in 1999 and I carried it everyday in plain clothes for 7 years and quite a bit since retired. It's still as stiff and looks like the day he made it. This one is mahogany basketweave.