I have purchased and used the following displays:
320*240 White on Blue with LED backlight 
  (no touch screen) from SureElectronics
  (part: DE-LM213) (http://www.sureelectronics.net/goods.php?id=775). 
  
  This is US$67.99 plus shipping (either FedEx at about US$25 or Hong Kong Post 
  at US$11). 
  Good service from these people and the display is bright and clear. 
  Can also be purchased from their eBay store.
320*240 Black(ish) on White with LED 
  backlight and touch screen from CrystalFontz 
  (part: CFAG320240CX-TFH-TTS) 
  (http://www.crystalfontz.com/product/CFAG320240CX-TFH-TTS). 
  This is US$122.21. I do not find this screen as bright as the white on blue, 
  but it does work well.
320*240 White on Blue with LED backlight 
  (no touch screen) from CrystalFontz 
  (part: CFAG320240CX-TMI-T) (http://www.crystalfontz.com/product/CFAG320240CX-TMI-T). 
  
  This is US$104.86. Similar to the SureElectronics display – maybe not 
  quite as bright? 
  As I purchased both CrystalFontz displays together the combined shipping cost 
  was US$47 via FedEx.
I also obtained some 5.7 inch touch 
  screens from iiiC Electronic Components. 
  They were US11.77 each plus postage 
  of US$7 (combined postage for all 3 screens). 
  I found them in their eBay store where they are combined with a USB touch screen 
  controller 
  (http://cgi.ebay.com.au/4-wire-Resistive-5-7-Inch-LCD-Touch-Screen-USB-Control_W0QQitemZ140337880894QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item20acca1f3e&
  _trksid=p4634.c0.m14.l1262)
  but as I did not want the controller I sent an email and they arranged for shipping 
  only the screens. 
  The email address that I have used for most communication with them is lidanmin@hotmail.com 
  (Katie Li)
  though the initial contact was through sales@iiic.hk.cn. I had a problem with 
  2 of the screens having 
  some damage when they arrived, but I contacted them and they promptly sent out 
  2 replacement screens. 
  They also have a range of different size touch screens that can be purchased 
  – check out the list in the eBay link above.
The touch screens were glued onto the non touch screen displays and appear to work well.
I had no issues using these displays with the 
  EA320 board – just made up an appropriate cable to connect each one. 
  I had to alter the resistors for the LED backlight current and also the contrast 
  circuit to suit the displays. 
  And appropriate resistors for the touch screens.
Gerard (vk3cg/vk3grs)