I (like most people now) have 50 invites to use up. If anyone wants one, PM me with your email address and I will send it (never post your email address on the forum)
At the left side of the Gmail screen (below the folders and labels sections), you will see a box that says "Invite a friend". Put the email address you want to send it to in the box, click "Send Invitation" and you are done
I also have masses of gmail invites. Email me at getalifebud@gmail.com with invite me to gmail as RE and message if you want an invite.