The deal website Tanga has several styles and colors of M-Edge covers available in their "top sellers" area for $4.99 plus $3.99 shipping, which is $8.98 total. Or, if you buy two, both will ship for the same shipping price, which brings the effective shipped price down to $6.99 each.
I don't know how long the deal will last - some of Tanga's deals are daily deals and others hang around for a while.
The link is:
http://www.tanga.com/deals/m-edge-ex...or-dell-streak
Hopefully this is affiliate-free since I don't see any funny strings of numbers in it.
I have an M-Edge cover for my Kindle keyboard, and I like it a lot - it is well made, fits well, and has survived getting bumped around in my backpack pretty well.
I've bought a few things from Tanga, and like most of the deal sites, they are a bit slow to ship, but I've not had any problems with them other than that.