I have been using a Pentax Optio S5z for the past few months after my Powershot S400 became unreliable. It's extremely lightweight and takes great shots considering its cost and size. I bought it from buydig.com for $152. The price has gone up since then, but it's still an incredible deal.

The only possible downside to the S5z is that it doesn't have a view finder. The screen is absolutely huge though and is protected by plastic. One thing it has that the Panasonics usually lack is the orange AF helper lamp (like the Canons also have). I find that to be pretty important for macros. The battery that comes with the camera is a little weak. It's rated for 150 shots, but even that is too little. I got a higher capacity one off ebay for $11 and it was well worth it. I can point out the seller if you're interested.