Where do you get a refractometer for $29?

Who's this "Rich" I keep hearing about? What's his setup?

I've found that if you rub a little mineral/baby oil, it cuts down on salt creep. Just a little on the outside, at the top under the lip.

Good:
I like the guys at B&B. The guys there have some good input.
It's good for livestock and they have RO there.

Bad:
The supplies run low from time to time.
Don't buy equipment there, it's insane expensive.

Are there any places to buy saltwater critters other than B&B in the Mobile Area. If not, where's the closest?