voltage data logger

Can anyone recommend to me a decent voltage data logger? It would be great if it can do 0-80VDC but in the event it only does like 0-30VDC, I can put a voltage divider in. Here is the hard part. I would need to have a memory to take a snaphot every minute and last five months (like 200,000 records) if possible. I can work with the time a little bit but not much. Oh, and I would need something under $100 :-) I need a few hundred of them if they work so that's why the cost needs to be low.

Sorry I tried to delete this message

I have built a data logger that stores sinusoidal voltages in SD -CARD 1GB.