OK, I'm collecting retro stuff for a while now and now I'm curious. Did some research. You only have the cart right? No Box, no manual?
A complete 3 in 1 was sold for 635 Euro back in 2011.
The pricedrop between CIB and Cart only is very harsh, so I will look further.
edit:
OK, found two "Cart only" Espaniol-Versions: one is listed with 5 Euro:
http://www.milanuncios.com/juegos-de...-132723438.htm
... the other one with 27 Euro.
http://www.milanuncios.com/juegos-de...-132420121.htm
So much difference a box and a manual make