I'm a little boggled by the notion of people buying preloaded Linux because it's cheaper.
My experience has been that preloaded Windows is always cheaper because it comes along with a boatload (or should that be "bloatload"?) of bloatware. The vendors of the bloatware pay enough to the OEM to defray the cost of the Windows, to the point that the final cost to the buyer is lower than a Linux install with no bloatware.
Now, maybe I've been looking at the wrong vendors, but the last time I looked at Dell, the equivalent Linux machine was always just a bit more expensive than that same Windows PC.