Ultrasound Question

I'm picking up an ultrasound machine this weekend and I'm wondering where those of you that use them get the gel for it and if there is one that is better than another. Thanks in advance for the help.

I don't think people really use the gel to ultrasound snakes. At least not from what I've seen. I think I've seen the Snake Keeper just have them in a tub of water or something. But I'm sure you can just google "ultrasound gel/jelly"