I saw it at Roots today, too. I know that's out of your range, hillrat, but posting in case someone else might want to know. They also have Heini's raw milk cheddar cheese, in case anyone is interested. It's pretty tasty.
ambition is the least of worries as it's ridiculously easy, but the question was where to buy, I'd say call Aatish on Penn or the Indian place on 8th SE. they'll probably laugh (since it really IS so easy) but may very well sell you some.
If you are in the mood for a road trip, you could also head up to maryland, next door to Tiffin (1341 University Boulevard East Takoma Park, MD 20912-7445 (301) 434-9200) is a small indian food grocery store that sells paneer.