I usually order mine from SyrupSupply.com. I get no $ by endorsing them, but we have teamed up to offer BreakMateSource.com users a discount on their orders. See the link at the bottom of every page. Very fast shipping, responsive support, I’ve had great success with them.
I’ve purchased some through Amazon and its okay. Pricing isn’t amazing, but not bad. Those are pretty much it for me.