Map of US and Canada

Hi guys,
I would like to purchase a big map of the United States and Canada so that we can put a pin in the cities where our customers and maple friends live. I'm having trouble finding a good map for sale online though and was wondering if anyone knew of a good source.

Criteria for the perfect map:
• show just North America/Canada (no Mexico)
• poster size
• Under $30
• states/provinces labeled. Labels on major cities would be a plus...

Let me know if you have any ideas. Our business needs some art or something on the walls and we thought that a map would be fun... It would remind us of all the great people we've met from being a part of this industry.

How have you guys decorated your sugarhouse/storefront? Any suggestions?