Most likely they only need a fairly basic PC. My sister kitted most of the rest of my family out with low spec PCs being offloaded for next to nothing (Eur50-100) from her job and they are more than sufficient for their needs (email, web browsing, word processing etc.). If you can source somthing similar for a buget price it might be an idea.
For info on internet connectivity options see the links in .
Local tech support/handholding is most likely a must based on my experience as the tech support department for my family and others... :|