Need help!

1

[COLOR=#2B2E2F][FONT=Lucida Sans Unicode]I’m hoping you guys may be able to help. I am wanting to offer a product subscription with a limited amount per city. for example Dallas has five available and if someone purchases then it auto drops to 4. Im hoping for them to have possibly a drop down list of available areas. I need to ensure i don’t have them being able to enter credit card info and making a purchase unless their is spots available in their area. looking to do this for all of north america. hope this makes sense[/FONT][/COLOR]