If you can find items stocked locally (shipped prior to tariffs I'm guessing) you can still find some components reasonably priced. I found what looks to be the exact same housing on Amazon here:
light bar on Amazon for $20. $5 more than I paid. I wouldn't try make these, although they look simple enough they have the extruded housing that's already painted, the end caps and the plastic cover over the lenses plus the weather stripping, the mounts and all the screws. You need all of those things and I can't image you could make anything close to that without spending 4x the price which is why I went in that direction.
Other components though are more expensive and in cases much more expensive on Amazon and don't 'look' as good: Closest I could find on Amazon to the LED Chips are these
LED Chips 50 for $30 - twice what I paid. These are the PCB Boards on Amazon
PCB Boards $9 each plus $4 shipping -- at least these look v. similar. I paid $2.81 for 10 pieces shipped
The alternative is that you still buy those things on Aliexpress and pay the tariff on them. From what I read its either $100 per package or 30% of the price of the goods. And it's the US shippers choice of which to charge you. 30% might not be bad on the cheaper items like 10x PCB boards for $2.81 -- adds less than a $1 to the price. But if they decide to charge you $100 then that would be bad. You might just be leaving the package behind - claim the contents are not what you ordered and lose $2.81.
It might just be a crap shoot...
Hunna -- I'm going to have to see what I have left over, its been a journey!!