Whoops. AT91SAM7S64 was what I meant to say.

I take it you mean LPC2106? The 2106 was one of the first in the philips range and is one of the most expensive of that family, mainly because it's got huge amounts of RAM & FLASH (compared to it's newer siblings).

Good luck!

[Edit]

I'm sure you're aware of it, but don't take any pricing from farnell/rs as being anywhere near actual cost. Arrow have the 2104 showing up at $9.95 in one offs.