Loupes can generally be picked up at a camera shop or hobby shop. To test the loupe, fill it with water and hold it over your eye -- then look around. If you can see, then it's right for you.
If you fasten the loupe to goggles, then you may need to adjust the focus by (1) using a slightly less powerful loupe (i.e., lower magnification) or (2) trimming a bit off the back of the loupe in order to move it closer to your eye (i.e., the goggles added a little distance between the lens and your retina, so you need to compensate for that by shortening the loupe).
A cool variation would be to put the lens on a little arm that can be used to swing the lens in front of your eye to see underwater and flip it up when you surface. Loupes that are designed to fold into a case would be ideal for this.
Very simple, very cheap, surprisingly efffective. I'll build a few prototypes and post photos.
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