They’re cheaper than you think.
Here are Longi 505w for $190 [1]
And 605w bifacial for $220 [2]
That’s full retail, not buying quantity. they’re cheaper wholesale.
[1] https://www.pioneersolarenergy.com/shop/solar-panels/longi-5...
[2] https://www.pioneersolarenergy.com/shop/solar-panels/longi-6...