OK ... you guys can relax now.
Sears.com allows you to view items sold and shipped by companies OTHER THAN SEARS. They do it as a courtesy to allow shoppers to find what they are looking for, even if Sears doesn't sell it themselves.
It's a marketing tactic to take advantage of the online search and sales engine that can allow businesses to compete with ebay and amazon in terms of item variety. Unfortunately, there's no real filter in place to keep stupidity out, like those obviously overpriced items.
I'm thinking the fool who priced those did so just to make sure that people would stop to LOOK, but wouldn't buy them, in order to show off his work but not actually sell it.
edit- the reason I happen to know about their search and sales engine... I spent 2 months searching online to try to find a store locally that sold MT#1 attachments for my mini wood lathe, and over and over it kept listing Sears, but my local Sears carries NOTHING in the way of lathes, tools, or attachments. I finally hashed out an argument with their manager over why in the hell they would advertise something as being "in stock" when it can't be found in the store, and he had to make a few quick phone calls after staring in disbelief at his in-store browsing computer catalog that showed the same "errors". Sears is selling for other small companies through their websites, but they were listing their (other companies) stock on hand as being in-stock at local stores by mistake.