There are several options for the sub-compact but the 45 is still new enough it is quite limited. Here is a link to help you with you search.
I'm looking for the best holster for my XD-45 and .40 subcompact. any good suggestions. I'm looking at the CQC from blackhawk serpa, but wanted to know if I can use that one or is there a specific one for the subcompact?
IWB or OWB?
I use a Tucker Answer w/ my XD45, works well. (fits both 45 and 40)
I just ordered a Fist #12 OWB, cant wait.
Many of the XD holsters will work with the XD45. Blade-Tech's kydex holsters work with all varieties in 4" and 5".
I bought a crossdraw holster from Tucker for the 45ACP and also one from Dillon, another great holster...
I bought the Galco M7X for my XD the package says it will work with all the XDs. It has worked great for me so far.
VERY happy with my 4 Fobus paddle holsters. Glock, Baby Eagle, Colt, and XD SC.