No! Stay away! Far FAR away! It's all MINE!
As far as the other questions, he usually prices his DS lites at $60/ea, DSi's at $90. The PSP-2001 he priced at $40, because I think it's a bit rough, but it works great. That one I'm keeping, and I might keep the blue DSi and sell my white one. Everything else is going on Amazon. One of the lites already sold this morning.
As far as a DS count goes, in addition to those pictured, there are two white DSi's (one wont run any games/apps, it just gives a black error screen), my gf's 25th Anniversary DSiXL, my daughter's pink DS lite, a beat up silver lite with a broken hinge, and a gold Zelda edition lite. I actually just sold a pink DSi yesterday, too.
Like I said before, this guy gives us some awesome deals because we buy ALOT from him in bulk.