I use a Panasonic bag which for a tenner from Comet ( clear out sale ) was a giveaway.

Almost free infact

The HC1 fits in it nicely as well as extra battery, , AC power supply , a firewire cable and a few tapes new and used
My point is that unless it is a reasonable cost it doesn't always have to be a Sony..
I did originally want one for a SONY from my Local Sony Centre but I was put off by their prices, and attitude.(it was seriously poor)
I'm glad I didn't as they would have taken my money and still felt they were doing me a big favour.
I do have a case like the one you linked for the FX1 ( it is larger .. and less portable) but for the HC1 you have to weigh protection against portability.
If the case seems heavy. you will be demotivated to take it with you on a whim
There is also the issue of travelling, Security agents and metal cases to consider