Amazingly amazon has this for 199.00 new. I was just going to use it for a nice walk around close up lens at a Jiu Jitsu tournament. I figured it wasn't bank breaking and it seems fast enough. Has great reviews so far.
Wow, $200 is a bargain. I bought my Tamron 17-50 f2.8 pre-owned at $390! Yes, I would go for it instead of the 18-105 kit lens if the condition is good.