This vQmod allows you to flag certain products as having prices that are entered by the customer.
Great for Invoices, Gift Cards, Donations, Best offers, Auctions, etc.
It uses any opencart product by simply flagging if it should allow a configurable price.
Since it is a product, all other properties of products can still apply (options, attributes, additional images, etc)
It will add to the cart like any other product, with the customer entered price shown in the totals.