what are the video cards support WSXGA 1680 x 1050 and what is their price?

You'll find the high end Matrox cards support this resolution and standard.

Prices vary depending on what exactly you need the card for (basic
display/video editing). As you didn't specify an application, I can
only forward you to the matrox site which lists available cards and
their res capablity, http://www.matrox.com/mga/home.htm

Sorry about that

I'd like to know the answer to this too... I found the Acer website
has a PDF with a list but these are all pretty expensive.

Here is the link:

http://www.acerpanam.com/synapse/forms/portal.cfm?recordid=510&formid=3390&website=AcerPanAm.com&originwebsite=AcerPanAm.com&central=1&pupv=pu

I've found information about graphic cards supporting this resolution
at pages about one Wide Screen Dell LCD

http://www1.us.dell.com/content/learnmore/learnmore.aspx?c=us&cs=555&l=en&s=biz&~id=monitors&~line=desktops&~mode=popup&~series=optix&~tab=other

i hope this helps:  http://nvidia.custhelp.com/cgi-bin/nvidia.cfg/php/enduser/std_adp.php?p_faqid=222&p_created=1108519274&p_sid=bH61GK_h&p_lva=&p_sp=cF9zcmNoPTEmcF9zb3J0X2J5PSZwX2dyaWRzb3J0PSZwX3Jvd19jbnQ9MSZwX3Byb2RzPTImcF9jYXRzPTAmcF9wdj0xLjI7Mi51MCZwX2N2PSZwX3NlYXJjaF90eXBlPWFuc3dlcnMuc2VhcmNoX2ZubCZwX3BhZ2U9MSZwX3NlYXJjaF90ZXh0PTE2ODAgeCAxMDUw&p_li=&p_topview=1