Bubble tea is less like tea than a liquid tapioca pudding. From having been almost impossible to find 5 years ago, bubble tea spots have opened up all over the Washington area. Even branches of Teaism now serve it, though its bubbles feel squidgy as though they've been cooked too long or saved overnight. Here are some other sources:

Bubble Bubble Cafe, 4511 College Ave, College Park, MD, 301 209 2992
Bubble Tea Cafe, lower level near Target, Wheaton Plaza Regional Shopping Center, 1160 Veirs Mill Rd, Wheaton, MD
Eden Center, Wilson Blvd at intersection of Route 50 and Route 7, VA
Jackey Cafe, 611 H St NW, 202 408 8115
Jumbo Jumbo Bubble Express, 765 E. Rockville Pike, Rockville, 301 545 1708
Le Matin de Paris, 7326 Little River Tpke # A, Annandale, VA, 703 914 0088
Li Ho, 501 H St NW, 202 289 2059
Maria's Bakery, 1701 Rockville Pike # B, Rockville, MD, 301 984 2228
Montgomery Mall, Democracy Blvd, Bethesda, MD
One Fish Two Fish, 2421 Pennsylvania Ave NW, 202 822 0977
Panda Cafe, 2138-and-a-half Pennsylvania Avenue, NW, 202 337 9119
Snap, 1062 Thomas Jefferson St NW, 202 965 SNAP
Tam's Szechuan and Bakery Restaurant, 748 6th St NW, 202 628 1668
Ten Ren Tea, Wintergreen Plaza, 825 Rockville Pike, Rockville, MD, 301 838 8680
Ten Ren Tea, 7418 Baltimore Ave, College Park, MD, 301 864 8920
Wheaton Plaza Mall, 11160 Viers Mill Rd, Wheaton, MD
White Flint Mall, Rockville Pike, Bethesda, MD
Wok & Roll, 604 H St NW, 202 347 4656

Shaved ice desserts, often available at the same outlets, are the original milk shakes, unreconstructed. 

Want to make your own bubble tea? Watch this video to learn how:

http://video.about.com/chinesefood/How-to-Make-Cold-Bubble-Tea.htm

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