Specify a minimum/maximum price for “User Defined Price” product fields.
What does it do?
The GP Price Range perk allows you to specify a minimum and maximum price range for User Defined Price product fields.

How does it work?
This perk provides a simple interface on the User Defined Price product field settings that allow you to specify a minimum and maximum price for the User Defined Price field. When the form is submitted, this perk will enforce the minimum/maximum price range and if the user defined price is outside of the specified price range, the form will return a validation error.