Assuming it's a System/36 ...
totally dependant on the model and class. S/36 was a standardised range of mini computers. It's also much more the realm of what I work on most of the time. And the range of what was offered was across the board.
So I'll lay this out two ways for you. If the the seller has no clue and randomly pulled an actual price from some advert on the internet I'd say worth the trip, possible. But you're more likely going to get a 5XXX series terminal than an actual 36 mini. My guess without any background is you'll be looking at one or more 536X units rather than a true mini component.
The terminals are far more prevalent than the minicomputer server units.
On the other hand:
The 3650 and 3660 server components were 350000 dollars plus. And an Ad or As unit started at half a mill. Weigh a few hundred lbs, look like miniature washing machines. About 4 x 4 x 6 foot cubes or 2 by 2 by 8 foot towers. Full of gold silver nickel clean copper and silver wires, telco boards and pin/peg board wire wraps. Now there's a chance here but companies usually dumped the terminals on the open market and had the server unit hauled out.
Those terminals however have a 50/50 chance of some socketed gold cap chips. Weigh between 50-150 lbs, may even have 8 inch drives (big silveride cases).
Head over to
Wikipedia for a full rundown of the various components to help get a feel for what you're getting into.
If this is a true full system, though, you're gonna need some help getting out of there.