Itachi will be available soon via coupons but it's tends to be limited for a few events at a relative high price. Then the upcoming weeks and months, he will appear more often and his price will decrease by a bit. This is basically how they introduce new ninjas majority of the time.

Learn to see the trend and don't assume that every new ninjas is not available to everyone. Some ninjas you can obviously tell are going to cost a lot or have been based on how CN has felt with them.