Does anybody know what these typically go for?

the NV and the vintage stuff?

Or should I just buy it?

It varies wildly but you should be able to buy the Initiale for around $125.00 to $135.00 per bottle. Buy one of the Intiale and try it first before you dive in deeper.

Thanks for the heads up Joe.

Also note that there is bottle variation due to the different disgorge dates. Check CellarTracker for the good disgorge dates before you purchase.

Some Selosse champagnes can be low acid with slight bubbles. It is not a style that everyone likes which is why Joe's advice to try a bottle is wise.

I would recommend to drink the Selosse in a wine glass and not champagne flute.
Also, decanting (yes, yes, decanting) it in a small decanter will actually reveal more bubbles and will change this Champagne dramatically.
But as wiml and Winetex wisely said: try to get a taste of it before you buy a few...
Hope you'll enjoy!