I think you may want to head out there as soon as possible:
http://news.yahoo.com/hiddencash-effort-pops-boulder-225931924.html
“BOULDER, Colo. (AP) — Someone is hiding envelopes containing cash in Boulder, Colorado, too.
Someone with the Twitter handle @HiddenCash began leaving envelopes containing $100 bills around San Francisco on Friday. By Wednesday, KMGH-TV reported (http://bit.ly/1lVnv5g ) a similar effort called @HiddenCashCO had popped up in Boulder. An anonymous group hid envelopes containing $40 cash and tweeted clues to their locations.
An anonymous Boulder group behind @HiddenCashCO told the station their effort was a way to spread a little happiness.”