If uve checked the news on AT, ull see that ATi have been busy sending all their boards to OEMs, which in turn sell em to their companies like the pre built computers. And so that is why there are very few XT-PEs being sold.
Ive never heard any news about shortages of the 1.6ns RAM, that i think is just rumour.
Also, from what i have heard and read in the news, the companies like CDW (i think they are called that) and Gateway, were supposedly selling the XT-PE to low, and to save their own backsides and profits they quickly cancelled all orders for the XT-PE because they wouldnt have gotten much profit or none at all.
There is loads of news for my paragraph above...
P.S. i also want to state that in the UK, where i live, there are quick a number of ppl who have XT-PEs and the pro and gt's are fully in stock, and the 6800 are starting to arrive in bulk, so over in the UK the shortages dont seem to be as bad everywhere else.
If u wanna check this stuff out, check
Overclockers in the UK
Also none of the prices are inflated too, if u use a currency calculator, the prices should be just above the MSRP.