@Sweet-Tempered I get "pouring fondant" (as opposed to the version that is used to enrobe cakes) from www.lepicerie.com. If you don't know of this resource, I highly recommend it for many ingredients used in pastry and chocolate in manageable sizes for a small business and at reasonable prices (I'm assuming you are in the U.S.; otherwise this idea won't work).
I have the Pawkit Aw meter (https://aqualab.com/en/pawkit). When I bought it quite some time ago, it was what was recommended by people here on eGullet, and it was about the only device available at a price less than astronomical. Since then others have bought and recommend less-expensive versions. I don't remember the brand names, but you can find the discussion in this thread:
