Ok so your looking for 3x3 and $300-400.
https://horticulturelightinggroup.com/products/260w-qb-led-kit
There you go, job done and you managed to skip the cheap crap and start with the best, Quantum boards. (Terms and conditions apply, other lights are available)
If though you do go for the cheapo options look at the real wattage of the unit not the "600w grow light" bit. look at the power draw in small print and aim for 50w per square foot.
Personally I would go for the kit above and either go for a 2x4 footprint or a 3x3 and know your results are going to be good.
Like this...
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