It's really hard to answer that question based on the info you gave. Is it for your system or another system. 256-bit Radeon 9800 Pro's are oftn under $200 here now, but seeing as you have an FX5900XT, it's not a huge leap in performance.
Going up in price, the GF6800GT can be found for $350-$400. Better say $400 + Nevada sales tax? as you will have to go to local shops or retail stores and not order online. Also the X800 Pro is the same price as the 6800GT.
I'd check into what retail chains are available out where you are going. Also if you can find out about small local shops. You can also look over the Sunday ads before you leave and see if something goes on sale. Best Buy, Comp USA, and Circuit City are 3 of the major retail chains that MAY be in that area. You should be able to see their advertised in store sales on there websites on Sunday.
Anyway, give a little more info and a general price range, and we can maybe help more. Also, make sure you know your prices from back home for various card of interest, so you know if it's a bargain here or not.
Hopefully somebody here has been to Las Vegas and can give you definate places to shop. Too bad you weren't near Fry's in California, as their sales are incredible sometimes.
*** EDIT: You are in luck. There is a Fry's Electronics in Las Vegas. Personally, i wouldn't pass up a chance to shop at that place, based on some of the crazy sales they throw.
<A HREF="http://www.frys.com" target="_new">http://www.frys.com</A>
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ABIT IS7, P4 2.6C, 1GB Corsair XMS 4000 Pro Series, Radeon 9800 Pro, Santa Cruz, TruePower 430watt<P ID="edit"><FONT SIZE=-1><EM>Edited by Pauldh on 09/22/04 08:49 PM.</EM></FONT></P>