I doubt you won't find a US manufacturer of these. I have dirt cheap ones which I bought directly in the markets of Shenzhen that work great, and expensive "smart home" brands that flicker and died.
My tips:
Do NOT get the waterproofed strips. Those have very cheaply made goop applied to the top surface which turns yellow and sticky in no time. The non-water proof strips are just LEDs on a flexible PCB, and very durable and even repairable if a LED fails (either by soldering, or replacing a chunk of strip)
The other items that is often cheap is the adhesive. 3M 300LSE, or 3M VHB tape is the best. Unfortunately many LED strips in China just print 3M on the adhesive regardless. Note that both of the adhesives I mentioned have the full number printed on the release, not just "3M". Finding authentic 3M adhesive is nearly impossible unfortunately. All I can say if the adhesive smells quite strong, it is probably authentic.
If your using single color LEDs, which need only a single power supply (12, 24V, etc...), invest in a good power supply. Rather than using the typical wall brick. A good regulated and filtered power supply will help ensure the LEDs are protected from shocks in voltage from say your air compressor cycling.
Since most manufacturers run the LED right near their maximum current rating, it doesn't take much overvoltage to kill them.
As robstyle said: Heat also shortens their life. So attach the LEDs to any sort of metal heatsink. This can be as simple as putting them into a L or U shaped strip of aluminum. If your display case is metal, this works too. The goal is to simply spread the heat away from the individual lights.
