I got a good deal on a used x230 ($140) with a docking station and charger on craigslist. But I had to wait like half a year before I saw one I thought was a good deal, and drive an hour to get it Luckily I was able to combine it with another trip in the same direction. This one is a backup for a second x230 I've had a long time, at least 8 years. I've replaced keys and recently the lcd plus of course batteries as well as memory and ssd upgrades. I think the best strategy is to pick a Thinkpad you like and then just stockpile used laptops and parts when you see good deal. I just use automated alerts from ebay and craigslist. That way you might be willing to try some tricky mod if you are not going to break your main machine.