The XD series has underdone certainly one round of price increases, perhaps two, and currently in the USA I just don't think they're price-competitive, whatever their many virtues.
The upside here is that the sweet spot in the Harbeth range was represented by the previous two generations/iterations: the Anniversary series and the non-anniversary series before that (e.g. 40.2 Anniversary, 40.2). Pick up a gently used pair of these in whatever model you're interested in, and you get all the Harbeth magic at a much more reasonable price. That's exactly what I did.