Where are you finding these panels? Renogy is over $1/W and they have usually been price competitive
370w panel for $266 (there's lots of good deals out there if you shop around).
If you want to save more money and buy by the pallet (22 panels), they're around $182 each for 330w: https://sunelec.com/shop/solar-panels/suniva-330w-solar-pane...
What about getting the power ut of the panels? What kind of other kit is required to accomplish this? a transformer and marine batteries?