There's a guy up in Canada on Ebay(his real name is Desmond Lundy, but I forget his user name) that sell basic snap-top cases. They are a green box about 12"x18"x1.5" with a cover that folds over the top and snaps closed at the front. The inside has a velvet lining divided into compartments, and the top has a thick satin cushion on the other side. Desmond is a pocket watch collector and most of what he sells are geared toward pocket watch, but he does sell a "Wristwatch and Fountain Pen" case where there are about 12 narrow slots across the width of the case.
His cases are about $20 apiece, although I buy them 6 at a time to save on shipping. Mine get fairly worn as they're what I use to take watches to shows(I typically stack 5 or 6 in a suitcase, belt them down with the luggage straps, and roll that into a show), but I still get a good 2-3 years out of them. Left at home, they'd probably last a LONG time.
They're not the prettiest things around, but at least are functional and not too expensive.
Go to an NAWCC Regional and you'll see a lot of them in use.
Here's a picture of me giving a talk at a regional with two of these cases spread out in front of me(I brought most of the watches I showed in the talk along)
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