Production standards vary by industry.
Museums demand very high quality printing and careful consideration of media and laminate. They are willing to pay a premium for that level of quality and service (which usually includes multiple consultations, print samples, and design considerations including viewing distance, lighting, cleaning and tactile interaction (touching). Assuming the graphic design was by others (likely in consultation with the fabricator, curator, and museum board), a project like this could range from $12,000 –$25,000 (and more for major installations).
Trade shows are a tier under in pricing, but usually require high quality printing with no blemishes. Here you are in the $7000 – $12,000 range.
A 120' x 8' for local retail or local event productions will price out at between $2000 and $5000 plus installation (coroplast, Ultraboard, PVC, or ACM panels UV printed or direct printed with top laminate).
I would think that inexpensive wall vinyl could be installed at the lower price range, but I would actually charge more for that than rigid panels. Control-Tac (air release) would be another option, but can be fussy to install and get lined up right. Again, I would likely use Ultraboard panels on a job like this.
The irony is that I would likely use UV direct printing on Ultraboard for both the museum quality job and the local event job. The end product would be identical. The difference in price is the level of service provided.