I"ve seen everywhere from 500 to 15K...
depends on the seller, and the value they place on the car.
I paid 2500 for my totally clean, 168K fully documented with full service history TD...
the deals are out there.
keep in mind the cars are getting harder and harder to find, and they only made a few thousand. and RUST is killing many many of them.
figure 4-6K and have an additional 2K for repairs ready to go in one, and you'll be pretty far ahead of the game.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!