Update: NY Ironworks sold out of the Uncle Mike's Sidekick, Ambidextrous Hip Holster before they were able to fill my order. The DeSantis Pro Stealth I got from them is still winding its way across the country from Brooklyn via FedEx.
I picked up the Uncle Mike's from a local gunstore for ~ $10 than I could find online, which is kind of saying it would have been a wash after shipping and handling. This was actually good, because the sizing Uncle Mike's recommended was not right (I tried it w/ my gun, in-store). If you go this route (UM-SAH), get the size 15.
I'm currently emailing back and forth with Safariland on this same type of issue for a holster I'm interested in*, and have been since last week.
* Safariland Model 4062: "Stuffer" Inside-the-Pants Spring Clip Holster for Pistols & Revolvers