Through the custom pricing module you can set product/item pricing specific to a customer.
Turn on Custom Pricing. Contact us to turn Custom Pricing (firstname.lastname@example.org).
Go to Settings Manage Lists Custom Price Tab: Price Level Names
Create ‘Price Level Name
Link ‘Price Level Name’ to Customers
Link Products to ‘Price Level Name’
When a product is added to a work order, it will now contain the custom price