When the HDR-AX2000 and HXR-NX5U were announced, Sony quoted the US list prices as being $3,500 and $4,950 respectively. But when they came on sale, retailers were actually offering the HXR-NX5U for $3,999. The comparatively small difference (it's larger in other countries) makes the choice between them difficult because you get a lot of extra features for only $500 more.
Now the price of the HDR-AX2000 seems to be drifting down a little, which isn't a surprise as the HDR-FX1000 - the HDV based pre-cursor to the AX2000 - retails for $3,199.
Over the past couple of weeks I've seen it on Amazon for about $100 off, but right now, Amazon has a couple of sellers offering the HDR-AX2000 for $250 off the list price: Sony HDR-AX2000 Handycam camcorder