The 24-by-36-inch Metro maps (which fold to 4-by-8) go on sale Monday at People's and Dart Drug Stores, Drug Fair, Safeway and Giant stores. You can also buy them at the following Metro outlets, where flash passes, tokens, Senior Citizen I.D. cards, and applications for handicapped I.D. cards also are available:

Metro Headquarters, 600 Fifth St. NW (8-4:30, M-F).

Metro Sales Office, 1422 New York Ave. NW (8:15-4:15, M-F).

Pentagon Sales Office, Pentagon Concourse, B-5 Stairway (7:30-4, M-F, closed 2-2:30).

Washington Terminal, 10th Street and Pennsylvania Avenue NW (9:45-6, M-F, closed 2-3); and from 7-7 daily at Metro bus terminals: 4615 14th St. NW; 5248 Wisconsin Ave. NW; 17 M St. SE; 600 N. Royal St., Alexandria; 3501 Glebe Rd., Arlington; 707 N. Randolph St., Arlington; and 4421 Southern Ave. SE, Coral Hills.

Metro's mobile sales van: 1601 K St. NW, Tuesdays and Fridays, 9:30-2:30;

E Street, east of 19th Street, Thursdays, 9:30-2:30;

1737 Columbia Rd., second Wednesday of each month, 1-2:30;

5500 Connecticut Ave., fourth Wednesday of each month, 1-2:30;

L'Enfant Promenade fountain, Mondays, 9:30-2:30;

2600 Naylor Rd. SE, first Wednesday of each month, 1-2:30;

3900 Minnesota Ave. NE, third Wednesday of each month, 1-2:30;

S. Clark Street, between 20th and 23rd Streets, Crystal City, Wednesdays, 9:30-12:30.

Route and scheduling information: 637-2437, 6 a.m. to 11:30 p.m.