This is the first time I've seen:

http://www.ebay.ie/itm/BIO-BOOSTER-GUYVER-ANIME-PRODUCTION-ART-SETTEI-SHEETS-/222127424583

On ebay, normally you see them on Yahoo Japan.

To anyone that wants to pay that much for them though, my advice would be no, don't. These get reproduced a lot in Japan and while very cool you can get them from the Yahoo Japan for around 7000 yen or less (which works out at about 50 to 60 Euro). 

For what you're getting from this ebay seller, it's an extreme price to pay.

 

Eeeeek! That's expensive,  well out of my budget

And considering these are reprints, even the price I mentioned above is a rip off. 

I've 3 packs of these. They've some great art in them, but nothing in it is worth that much and as I said it's a reprint.

Matt got the rare version of a few years back, which was the same prints in a book format.  

Those are nice. But it's not something I'd want to spend my money on. 

Nice but yeah, way over priced.   That's why I like Buyee lol.