Try eBay, I managed to get a screen that fits the A10 A20 A30 A36 and S10 imported from Japan it only cost £17 with P&P, however the average for these replacement screens is £40 odd. Oh and the ones from Japan come with tools for opening the camera.
And as for how difficult it is to replace all depends on if you have a steady hand or not, I tend to use a magnetised screwdriver to avoid losing the screws.
Word of advice don't touch the flash capacitor it hurts.
G-string8086
May 2009
Automatic Answer
While you wait for answers, we may have found some information which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix digital cameras.