I would think the onus would be on you, the application / web developer, to provide a portal (with a login) to let them modify whatever values they'd like. This sounds like a fairly embedded application, and if it's simply prices, it could be as simple as giving them a directory to drop their 'prices file', from which you dynamically update the pages.
There are a number of customizable CMS out there, and things like WordPress are commonly used to allow 'customers' to modify their own pages. Depending on how much control they need, this may or may not be enough.
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