Looks like a generic old school PJ-003 like dcpowerjacks.net has, just check the pin width, the MSI is a 2.5mm as per ebay. So any of these laptops share
the same jack:
http://www.dcpowerjacks.net/catalog/index.php?main_page=product_info&cPath=15&products_id=49
Maybe you can find one of them close to you ?
EDIT: Almost forgot. Many people use the PJxxx method for identifying jacks so you can also go to ebay and search on "PJ003" and find hits which might get you additional closer dealers. Just be sure of the pin size.