I'm with Beldaraan. If you really love, it, then you probably won't be sorry you bought it, and you can put your time and effort into other projects.
Those cases appear to be beautifully made and professionally finished. Someone who doesn't know how to sew would find it difficult if not impossible to match that level of quality. It all depends on what you're looking for and how important aesthetics are to you. And if you're going to splurge on an expensive case like that, plan for the future -- make sure that the arrangement of the case fits your anticipated creative needs.
[Soapbox confession: Sewing is my first love as a hobby, I've been doing it since childhood, and I find that people usually underestimate the time and effort it takes to do it well -- the same with knitting and other handcrafts.]
OK, down off the soapbox -- what about the suggestion of purchasing the fabric on ebay and then sending it to the person making Amy's case pattern? That might save you some money?