From the STL Santarchy list:

With regard to how Santa is going to visit the city this weekend, we're riding Metro (link and bus) for most of the journey. In previous years we did this by having everyone purchase a Metro Day Pass, which costs $4.50.
To avoid the Santas becoming lost in the city, try to buy your pass early.

If you ride the train to your first destination, you will already have your
pass.

You can also pre-purchase a 1-day pass at many Schnuck's stores, then
validate it on your first ride.

I suggest using zip sort to find a convenient Schnucks,
http://www.metrostlouis.org/Fares/FarePurchase.asp?offset=0

For those purchasing at a metro station, put aside a crisp $5 bill for your
purchase. That will greatly speed up the line, and you wont end up with a
bunch of $1 coins as change. Many of the metro machines will NOT take a $20
bill - besides, do you really want that many coins as change?

FYI - if you do not have a 1-day metro pass, buses are exact change only and
do NOT sell all day passes.

So, anyone wanting to join in during Santarchy will need to budget $4.50 for transportation (Cheaper than gas, even now!) and of course some spending cash for the various establishments. We also have the use of a School Bus for some of the route, since the Metro system still has many holes in it, particularly late at night.

Also, if you wish to join the St. Louis Santarchy group, please check out the Yahoogroup:
http://groups.yahoo.com/group/stlouis_santarchy/
Feel free to sign up!