Hi,
So there's mainly three clubs in the STL area, and all have some good saber fencers: Parkway Fencing Club (Monday and Wednesday Nights), Academy Fencing Club (Tuesday and Thursday Nights), and Gateway Fencing Academy (M-F Nights and Sat mornings) [There's also a couple of saberists w/ Wash. U. in StL, but they don't meet during the summers, etc...]. PM me and I'll give you more info, etc... :-)
edit: here's links to all of the STL division clubs:
http://sports.groups.yahoo.com/group/stlfencing/links