Crescent City is like 8 hours from here. There must be a maggot or one of your Ham Radio buds up that way who can go check out the bike. If its legit, send the maggot a certified check or paypal the money to him and have him give the guy cash (or something like that). Or just spend a whole day driving that new car of yours - or better yet rent the cheapest car you can and put a ton of miles on it. Maybe you can find a hottie on Craigslist who needs a ride to Eureka and wants to pay your gas.
My first reaction to the Wester Union thing is that its definitely a scam.
Why do you need a new mountain bike? What happened to the one you had a few weeks ago?
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