dollar?

I can't believe I'm asking this here, but honestly, I'm desperate, so I figured, why not try. I'll let you in on the situation. I'm on a small, fixed income with no money left in the bank, until next month. I do however have $4.08 in my Paypal account. There's a guy selling a small custom part...

i saw some pics of the Windber Minibike Reunion and saw some bikes with dollars clipped on to the handle bars. Does anybody who was there know what this means or represents? :shrug: