well, you could send him an email saying "Ill give you $150 right now for your bike" or " My wife says I can only spend $150 on a bike will you take that? what is probably alittle more common and smarter than buying something in the dark is to email him and arrange an appointment to meet and look at the bike and test ride it. Put $150 bucks in one pocket and $50 in the other. whip out the wad and say how about 150? if he protests then break into the other 50. look over everything and if something isnt perfect use it to justify your lowball offer. it needs new tires, i have to replace the grip tape and cables, The wheels need to be trued..yada yada.