I need a place to trade 800 microsoft points for 1 month of live?

Hello, Are there any websites where I can find people who are willing to trade a 800 microsoft point code for a 1 month xbox live code? Amazon gave me a 1 month live code via email for ordering 4000 microsoft points and 3 months of xbox live. The problem is that I am not expecting the xbox live code to come in the mail for another day or two and I need xbox live now! The 4000 point code and the 3 month code are coming in the mail sometime in the next few days, But I already have the 800 point code since they emailed it to me. Any help is greatly appreciated! Thanks.