Ok - I'll admit it - I still love to use my 510 when I go out for the portability and convenience. I've been using the CE2 Plus clearos XL and got them at a discount ($3 for a 5 pack!) - they were being discontinued (why I don't know). These clearos are friggin great (to me anyway). They last literally for weeks and were sturdy and didn't leak. Has anyone seen them in their web travels anywhere? I've searched everywhere and everyone is sold out. I absolutely love these things and don't understand why they would be discontinued. Or does anyone know of anything comparable? Any help would be greatly appreciated.