I am looking for 6 mudcap tiles. I was told they are possibly a
Florida Tile series A4200 and the color is #291 "Buckwheat" or
"Oatmeal". I would appreciate and leads.

Well, the A4200 part describes the shape... I cannot think of anything
in "Oatmeal" or "Buckwheat", so it has to be from before 1994... and
the # doesn't ring any bells.
You could try Orlandini Tile in New Jersey. 
They tend to buy closeouts from Florida Tile.
Good luck!

Mid America Tile - Illinois

My scavenger plumber friend has gotten me a garagage full of Jeffrey
Court decorative trim tiles in approximatey 10 patterns including
Falling Leaves, Tulips and Turtles in 6"x2" and 2x2 in several
beautiful colors.  I'm only remodeling 2 bathrooms so I've got a lot
of tile to share.

Do you guys have any suggestions on where I might sell these tiles
(preferably in bigger lots).

Any help would be appreciated.