It's easily >$1M for the 110 GHz versions. In general, 4 channel scopes are 20-40% more than their 2 channel counterparts.
It's also worth mentioning that for this level of equipment the buyers usually have some sort of purchase agreement with us and they aren't paying 100% list price. I was also only half-joking about a student discount, we'd definitely talk options with whoever is serious and interested.