Plus it sounds like they're going to be doing a souped-up version of Ollivanders: small groups (which must be "scheduled," apparently) will be guided in a 20-minute experience to create their sabers. So Disney wants this to be an attraction in itself, which - though potentially fun for those who will throw down the cash and go through the hassle of "scheduling" - could be a questionable choice.
It doesn't appear there will be a place (at least initially) where a person can just walk in and buy one.