This post seems a bit suss to me.
That link screams Virus to me. I'm not game to click on it, anyone?

The board alone would be worth around $300 here. However, unless you weigh under 60kg, that board is pretty small and definitely not an ideal size for learning, especially if you kite in light winds...and by the size of these kites I'm guessing you have light winds where you are.

The kites do look well used but they seem to have some life left it them. If they're not leaking they could be great for learning and you might get a season out of them. Just put a stick-on patch on that small canopy tear.

Those lines on the bar however look like they need to be replaced soon. If I'm reading this right it looks like 20m lines , which is too short especially for flying on large kites, I hope you can find some 4-5m extensions.

Kite sizes are important so you want to ask around where you live what sizes other kiters the same weight as you are using, and the same for board size. No point buying cheap stuff if it's not the right size for you and your location

Christian