For $160, I would grab it and worry about spare mags later... but there's actually nothing to worry about.
I'll make a post about this eventually, but I've acquired three XD or XDS pistols in the past few months: 9mm, 40 S&W, and 45acp.
GB and Midway had plenty of magazines for them, NP. I ordered a spare for each pistol with no difficulty at all. Amazon had nice leather holsters. Pearce has grips extensions if you want one (I did).