I was also helping my friend to source for 1. I actually called up AlanPhoto last week. They said they got 2 units left. But finally I got a second hand unit. Its much cheaper than a new one.
I myself is a 400D user. I would say compared to the 350D, only the LCD thing is a bit annoying. Like, when you need to change from single shot to multiple shot mode, you need to press more buttons to go into the menu. Whereas the 350D is instantaneous. Otherwise, I would go for the 400D. The LCD preview screen is much bigger and the image quality is 10MPixel. More worth it IMO. Better to learn to get used to the LCD and get higher res pics, right?