According to this thread on BGG a copy of Jati just sold for $1026.76 plus shipping. That's over £540 in real money! Apparently it's a real collectors item as only one hundred playtesting copies were made back in 1965/66, and most of those were destroyed.
Wait a minute. I've only made one hundred copies of Border Reivers...
Buy now to reserve your 'Guaranteed to be worth a mint in 40 years time'* copy.
* The last statement is a complete fabrication. It's not really guaranteed at all.