You have inventory valued at $15/unit that is obsolete as the product has been EOL’ed.  You have the opportunity to sell this inventory for $20/unit but the buyer can’t take it for 6 months. What do you do?

As the Spare Parts Purchasing Manager you have negotiated a contract with a manufacturer to provide parts to your company over the next 5 years.  These parts are expensive, critical to the company's manufacturing process, and require long lead times.  You have been contacted by an alternative vendor which is able to provide you the same parts cheaper and with shorter lead times.  Would you pursue this option with the alternative vendor and why?