Rai stones
http://research.stlouisfed.org/fred2/series/M1NS
Travelers checks around $4.4 Billion
(was around
$ 6.2 B in 2008, a 1995 peak
of $9.4B)
http://research.stlouisfed.org/fred2/release?rid=21&soid=1
http://www.federalreserve.gov/releases/h6/