it was first listed a while ago, Nvidia's upcoming Geforce GTS 450 has now showed up in quite a few shops in both Europe and the USA. The price is quite similar to both regions as the Europe listing shows it for €149,90 while the USA e-tailer has two cards for US $144.99.
Of course, if you compare prices in the USA and the Europe it doesn't make sense, but as always, Europe pulls the shorter straw. One European shop in Austria lists Colorful's Geforce GTS 450 for €149,90 but we are sure that the price will be lower once all the major e-tailers/retailers join in on the fun.
The USA based e-tailer lists both the Gigabyte's overclocked card and the Asus' reference clocked for the same price so we are not sure how precise is this listing but we guess that you possibly can pre-order it with that price. Both cards are listed at US $144.99.
You can find the European listing here
and the USA based e-tailer site can be found here