[Jtsummers]

You could try attending a gaming convention. Assuming the US, Origins and GenCon are both a lot of fun and relatively inexpensive (outside of travel, hotels for < $200/day, cheap with a group, and the registration is usually ~$70 for the whole thing + $6/game you want to attend (usually 4-6 games)). Also, you might be surprised who among your friends and friends of friends is interested in this stuff. I've had a lot of luck getting to know people who were in local theater groups, and random colleagues.

The hardest part is just coordinating groups as people start having children and getting married. Just aim small, 1 Saturday every month or two, and you can probably get a steady group.