Best Place to buy LED light bars?

I’m trying to light up strip lighting for a large barn. Cheapest place to get warm led strip lights online? Recommendations on types / brands as well?

Look we are going for (top)
Facility we are lighting (bottom)

Any feedback? Also, is it true LED light strips yellow after a year? Are spot lights better than strip lights?

Thank you very much

They have poor heatsinking if you go for the flexible ones. That and the glue will fail as well as the leds over time. The silicon yellows and the LEDs go brown and then fail usually.
I would go for aluminium backed ones so you have some form of heat sinking. They aren’t flexible but they are a better option.
You would need too many spot lights to achieve the look that you want

I think the type of lighting used in the reference photo is fluorescent tube, or LED-tube.

If you plan to sheetrock the interior, the space height you are wanting to illuminate, you might consider installing the lights into the peak (opposing each other) and down the truss for better lighting.

If installing into the peak, fewer light fixtures will be needed. But, replacing tubes will require a bigger ladder.

Any suggestions for LED Light bars (since those are better than LED tape)?

I like this a lot but there are not prices and may not be the best bang for the buck:

These seem pretty good as well:
https://www.superbrightleds.com/moreinfo/aluminum-light-bars/aluminum-led-light-bar-fixture-low-profile-surface-mount/1683/
https://www.superbrightleds.com/moreinfo/aluminum-light-bars/weatherproof-led-linear-light-bar-fixture/2148/

I would personally just use workshop fluorescents but since you want LEDs:

I know the FastTech has a good selection of cheaper COB-style LED light bars: is this what you are looking for? You would have to wire with Power Supplies to provide the appropriate DC current, and they would also need to be mounted in some way with a thermal path for cooling.

https://www.fasttech.com/category/1609/diy-kits-parts-led-emitters?sort=r&keywords=cob

This results in you seeing the light source, which kills the effect and hurts your eyes.