When I carried the Sig P245 was prior to anyone making a holster for the P245. I finally had one made by Internation Handgun Leather (IHL) in Phoenix, Arizona. I would check with Black Hawk, Fobus, Safariland, Bianchi, etc. I just had a holster made for my Springfield XD 9 mm 5" barrel by Safariland, being that I'm in a wheel chair I found what looked like it would work from me and had the Thigh Holster made, took about three weeks to make. I love the holster and it ran around $126.00. The holster has a safety release slide that is in the right postion to remove the XD as quick as if there were no safety release.
To be honest, I do not believe the Sig P 245 really became a very popular from Sig since Sig came out around the same time with the Sig P229 9/40 became available. I eventually traded the P245 for the P229. I wish you good luck in finding what you like in a holster for the P245