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Indeed it isn't. I have contacted a few regional, but have found places to contact nationally as it would change cost. This could also apply to billboards in strategic locations, which would be cheaper on some level.
For billboards, it vary's on which company you go through, how long and where you want them to market. If I recall correctly depending on all that it ranged from around $2,000-$10,000. which is quite a range. I'll go back and see what i can dig up.
This site has some great rates!
For a mobile billboard:
Not a problem. I'd be very interested in looking into a billboard with a few others as well as a possible way for us to advertise.
Me as well.