2002-2009 GMC Envoy SUVs used keyless entry systems that had either a 3-button or 4-button remote with FCC ID MYT3X6898B. Remotes Unlimited has the 3-button version on sale now for a very good price. If you have a 2002, 2003, 2004, 2005, 2006, 2007, 2008 or 2009 GMC Envoy, follow this link to buy a replacement keyfob at a great price.
These remotes are new and user programmable for all applications. You get instructions for self-programming plus free technical support. What more can you want?