Hey, the next time you're in Arlington on a work day, let me know -- there's a place across the street from where I work that has excellent, cheap sushi. I 'loaded up', and it came out to about $11. Of course, that was before prices went up due to gas prices, but I bet they're still pretty reasonable.
There's also a place in Thurmont that's pretty reasonable and excellent quality, I can ask after the info if you want.
I, unfortunately, have to eschew sushi (being on Lipitor, you know). I still have it once in a while, but for the most part, I just avoid.