NewEgg is good, but there are some things to be aware of. And, yes, I buy things like hard drives there.
1. If you are in California, you will be charged tax (unlike Amazon).
2. You will be charged shipping in many cases (unlike Amazon).
3. While their return policy seems good, it is a minimum of 15% for most items. Worst of all, you do not get a refund for the original shipping, and are responsible for return shipping (unlike Amazon). This is the deal breaker for me, as I do a fair amount of returns, and NewEgg just doesn't make sense.
I prefer Amazon, except in cases where the price difference is so great, that it outweighs the above advantages. In this case, if you are sure you are not going to return the Zojirushi, it seems like a great deal. Otherwise stick with Amazon (or my other fav Costco).