Well new to me anyway.

First up is a new dosing pump I ran into at twopartsolutions.com. It is $79 and doesn't have a backflow issue like th aquamedics. Some people have already posted some positive comments.

http://www.twopartsolution.com/index.php?main_page=index&cPath=26_30

Second is a water sensor. I had a few requirements and this one met them all. I wanted it to be battery operated (I am running out of plugs and you never know what water is going to short out), loud, ability to test the battery easily and the sensor seperate from the buzzer. Oh and it should be pretty cheap. This is what I dug up. Tested it and it works great.

http://www.aquacave.com/detail.aspx?ID=1221

it looks like the peristaltic pump that twopartsolution (http://www.twopartsolution.com/index.php?main_page=index&cPath=26_30) is selling is just the APT Instruments (http://www.aptinstruments.com/Merchant2/merchant.mv?Screen=CTGY&Store_Code=AI&Category_Code=P2) pumps.... but cheaper (somehow).

I actually have one of these that I use for my topoff.

A dosing pump for that price is really good. For top off, I use the little $10 aqualifter. For dosing I use the LiterMeter which is reasonably priced for dosing pumps, but still expensive compared to those dosing pumps. Course the LiterMeter has a built in timer/controller so you don't have to figure any of that out.