iphone 4s dock connector replacement, how much and is it possible ?

If the connector has failed due to a bad component or assembly, Apple will replace the iPhone under warranty. Make an appointment at an Apple Store and discuss the problem with the technician.

If the problem is a damaged connector due to accident or abuse, Apple does not repair iPhones, but will replace the entire iPhone for a flat fee; see the Repair Pricing section here:

http://www.apple.com/support/iphone/service/faq/

There are independent iPhone repair services that may be able to perform a repair for less. Do a web search for "iPhone repair". Note, though, that if you elect to have the iPhone serviced by an unauthorized shop, all further warranty will be void.<

Regards.

Apple does not repair iphone nor sell replacement parts.

If it is damaged, you can buy an out of warranty replacement iphone for $199 in the U.S.

If it is defective, then they will repolace for free under the one year warranty.