Just to chime in, if you look at Gauntlet's web site, you'll see a few Lettered PC's for sale. They usually always come with the slipcase, so they don't get confused with the regular Lettered Editions. I bought the Lettered PC for $500 (instead of the regular $1000) of Bradbury's Dark Carnival. It was worth it, as I wanted the extra work, not the traycase.
I guess the point of this thread is Gauntlet is one of those publishers (like PS did with Colorado Kid) where he'll sell Lettered PC's as stock.