Can't find anything on eBay myself right now (for XS).
Kahr's site lists them in stock at $120 (same price as XS, though they don't list Kahr pistols). They've got the Meprolights at $59. Trijicon's are listed as temporarily out of stock.
I like the Big Dots. Not sure if I like them well enough to consider switching from my Meprolights. Maybe a good reason to buy the pistol without night sights and switch.