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Jan Hackett
Theater Operations Manager
Extreme Screen Dynatheater
NM Museum of Natural History Foundation
However, used 8/70 prints may be hard to come by, as it is not yet as widely used as 15/70 (but it's growing).
To say that you purchase the print is a bit misleading. that original payment of up to $50k for a 3D 1570 print does not give you any kind of ownership , it really is just an initial lease fee. At the end of your license period you are supposed to return the print .
You are right nWave do have a more commercial attitude to leasing but I am not sure that any of their titles would fit Jan's theatre remit.
Mind you I suppose Elvira's performance in Encounters in The Third Dimension is a kind of natural history 
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Dick Vaughan,
Cinema Operations Manager
National Museum Of Photography, Film & Television,
Pictureville
Bradford BD1 1NQ, England
http://www.nmpft.org.uk/
In reviewing a couple of contracts (which are not necessarily from any theater I am affiliated with):
Distributor A: "The print and all trailers are at all times the property of [distributor] ..."
Distributor B: "[Distributor] shall provide to the Exhibitor one quality assured 15/70 print, one soundtrack [...] and one 15/70 3D trailer and accompanying soundtrack of [film title] for a total cost of US $[xx,xxx] ..." Then on later pages: "[Distributor] shall arrange with Exhibitor immediately upon termination of the Agreement for the return of all Prints and Soundtracks ..."
Distributor C: This distributor required the theater to pay $x,xxx for a used, unassured print to be delivered at the theater's expense directly from another theater. The contract (Letter Agreement) the theater signed was 2 pages long and there were at least 14 pages (of Standard Terms and Conditions) the theater never received. I assume that print return information was on the pages the theater never saw.
My previous comments may be confusing because there are some theaters that purchase rights based on the fact that they want to library the film and have exhibition rights at their leisure. In other words, they will play the film for a normal engagement, after which the print will be played at the exhibitor's whim.
And yet other theaters invest in the production of certain films and gain additional special exhibition privileges.
Throw in equipment leases, ticket royalties, seat royalties, etc., and everyone is thoroughly confused. 