A Zumwalt destroyer cost $3.5 billion to build. With development costs added in, each of the 3 ships in the class costs a good $7 billion apiece. THAT'S expensive.
A Flight III Burke is projected to be costing $2.5 billion/ship.
Years back, when I first began to study ship costs, a current Flight IIA Burke was being quoted at $1.6 billion/ship. It has risen with inflation over the years to $1.8 billion, and many current articles are simply rounding everything up and calling them $2 billion apiece.
Both the RN Type 45 and Type 26 cost over £1 billion each.
The Constellation class frigate--not yet under construction--is projected to cost anywhere between $850 million to $1.2 billion. When first proposed, the Navy figures were $950 million, and Congress got upset. Since then, Navy figures have gone down to $850 million. Other analysts are skeptical, and are figuring the $1.2 billion figure. It remains to be seen. $1 billion is "the magic number" for this program. With a Burke costing $2 to $2.5 billion, the new frigate must remain significantly cheaper to be of value. The further over $1 billion, and closer to $2 billion it ends up, the less it will be worth it.
I have seen a "high-$200 million" figure for the initial estimated LCS cost being commonly quoted. (Something like $285 million...I don't recall exactly.) I have also read, however, that this cost is actually the estimate for the Streetfighter--a 1,000 ton corvette--not the LCS. As that program morphed (mission creep in overdrive) they ended up in the "high-$400 million" range. Let's round up and just say $500 million/ship. While that is the ballpark cost for the hulls, the mission modules have come in under their initial estimates. I have read different figures, and there are 3 different modules, but adding $200 million per module is a good ballpark number. Totalling each LCS out at around $700 million/ship. This why Congress initially got upset when given a $950 million estimate for the new frigates. After all the cost overruns, the LCS program was finally "stable" at around a $700 million figure. The Navy suddenly announced it needed a newer ship at $950 million, and that is an unstable cost very likely to rise further.
So, "expensive" is relative. It would be useful to have a sense of that relativity.