I ordered a Dowco Weatherall Guardian Plus cover from Revzilla. It sounds like a medium would be a better fit, but there was only large size available. It cost me $80, shipping was free. We'll see how it stands up to the New Mexican sun, wind, rain, dust and snow. Seems to me like an investment worth making... I love my Scrambler!
On the other hand, if you're bringing a cover along with you on travels (which I also don't really see the point of -- its a motorcycle, not a baby! I think it can handle a few nights outside in the cold!) there were a few options that seemed lightweight, like they'd do the job, and would be very easily packable. Those options cost about $16 on Amazon.com. The packability comes at the cost of durability for long term, in that case.