I recommend the Olympus TG-4 for macro photography. You can set the white balance to take some pretty good-looking actinic photos. I have the TG-3, which you may be able to find used for slightly cheaper - though the features are almost the same. Retail for the TG-4 is slightly more than you want to spend ($350), but you can do in-tank shots since it is waterproof and get super-close up with great detail. They are incredible cameras! They are also point-and-shoots, so very portable!
Also, these cameras have focus stacking built in.
Here are some of my recent actinic shots from the TG-3. These are all unedited, straight from the camera.