Another option is to get a laptop on sale at Office Depot/CompUSA/BestBuy/etc. Just get one that OfficeDepot will be selling in limited quantities 'round Xmas shopping time (next Friday!).
In March 2008, I bought a Compaq F750 for around $300 ... if that.
When I got home, I formatted the drive in the process of loading
Ubuntu.
You can download the ISO to make an install CD or download the installable version for a USB Stick.
Very Windows-like menuing system, but nothing like Windows when it comes to speed and security ... Linux does NOT need anti-virus and all that other crap!
You can even TRY Ubuntu, versus installing it, right from the same CD/USB installer, first!!
And, if you have a must-have Windows app, you can
load WINE under which you would then install your preferred Windows app(s). I have and use
WINE, as well.