Not free but cheap mod!
 

Hello!

Good news! New mod is released by Phpmagicscripts.com .

Price Agent mod for X-Cart

Allow your visitors post Price Agent requests about preferred price for products in your store!
In this case your visitors become potential customers in future when you will decide to reduce prices! Because they will get automatically generated e-mail notifications about reduced prices.

Released for 4.1.8-4.1.11 and for 4.2.0 versions!