What is good price to pay for a CIB Final Fantasy? They seem to be selling cart only anywhere from $5 to $15 on eBay, and I bought my CIB for $15. Was that a good deal?

CIB for $15 is pretty good, and if it had the maps, etc and is in good condition, then you did really well. Good condition complete FF's sell for around $40 as there is usually a decent demand for them.