Hey,
I saw your post on PAL. I have a Hi Bebe 2mhz doppler. I believe it is a BT200, but I would have to go get it from the closet to check. I also have two bottles of the gel that are not opened. I only used the small bottle that came with it. (I only used it once per week for a while.) Page me on PAL if you are interested. I really had not thought about selling it but when I saw your post...