Not a hard case, but I bought this Ex Point Eco Canvas case at my local Borders yesterday:
They had it on sale for 50% off and I had $15.00 in Borders Bucks I couldn't use for ebooks so I got it for free. Fits the Sony PRS-650 in the lighted case like glove and it is well padded. The stretch elastics on the outside keep it nice and tight. Ex Point also sells a black cordura case witha velcro closure in the same dimensions, but it wasn't on sale.