Just got my MQ 200 about two weeks ago. Under $300, free shipping, shop around the net and wait for a sale, but still not much below $300. I think mine was $289 or so. Easy to use, auto shut off. I purchased to do some research projects at work. If you get this one and plan on using it a lot (for the local aquarium club, etc), I recommend buying the telescoping "arm" to help take measurements. I made an arm by twisting some 10 gauge copper wire (w/power drill). Works pretty well, but not quite rigid enough and hard to store @ 3' long!