I just put Tracks Dennis Hopper into Amazon search, seems as though its gone up in price a bit, it's now on there for about £20.
There used to be a different version when i looked previously that used to be about £35.
Hope that helps.
There's an american disc on ebay at the moment for about £25.
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MIKE: I've got it! Peter Cushing! We've got to drive a stake through his heart!
VYVYAN: Great! I'll get the car!
NEIL: I'll get a cushion.