What is the issue price of a Year 2000 coin by artist John Mardon of the Included in Steam Buggy mintage.
CREATE TABLE "land_sea_and_rail_transportation_series" (
  "year" real,
  "theme" text,
  "artist" text,
  "mintage" text,
  "issue_price" text
);
SELECT "issue_price" FROM "land_sea_and_rail_transportation_series" WHERE "artist"='john mardon' AND "year"=2000 AND "mintage"='included in steam buggy';