Surely, knowing what the requirements are, we can build a cheaper Tomahawk missile these days, right?

SpaceX does the whole rocket launch thing for a fraction of the cost of the space shuttle. GPS is not that complicated any more and all the processing power required fits in a chip the size of a cellphone.

But those things cost 2.5M a piece?

It's not just the cost of a GPS chip, it's the custom turbofan engine, the other guidance system components, active radar (in some units) and a guarantee that you can keep the unit in a tube for years and ensure that it's gonna work when you need it.

Plus low volume production volums and long times needed to manufacture it.

Could it be cheaper? Yeah I'm sure. But the US Gov is willing to pay for em so why drop the price?

Would building something reliant on GPS be the right way to go? We've seen how easy it is to make it not very reliable. Musk has also shown that StarLink/Shield reliability are at the mercy of how he feels that day. Internal navigation still seems the most reliable for Tomahawks

Anduril has several cheaper competitors to the tomahawk in the pipeline

One of the difficulties that I've heard described is that the United States is the world's best producer of castle technology and has been for the last two centuries.

It has been the best, second to none for a long time. If you want the best castle, you buy it from the United States. Other countries may also sell castle technology... though as Norway noted it doesn't have to buy the best (and most expensive) from the United States, it just has to buy something better than Russia's. ( https://www.reuters.com/business/aerospace-defense/norway-se... )

... And then with the conflicts in Ukraine and to a lesser extent Iran the world has realized that while we've had the best castles for a long time, they're big, expensive, expensive to maintain (and its own hasn't been maintained well) and has the possibility of a switch on the drawbridge that will let it down when the US wants in...

While Ukraine and Russia have rolled up to the battlefield with a cheap cannon that is demonstrating that expensive castles aren't all they're cracked up to be.

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Yes, you can probably build a cheaper Tomahawk missile today. However, can someone else build a cheaper drone that is even better for the battlefield theaters of the next several decades?

That is happening, just slowly.

i am not a medical professional, but i urge you to get checked out for Engineer’s Disease