Bulk Defoamer

I am looking to buy about a liter of defoamer, but I am having difficulty finding a source. Anybody know of a place that sells this by the liter?

 

If you're talking about Fermcap-s, I buy it from my LHBS in 500mL bottles. In fact I've got two of them in my fridge right now. Both my locals get them for me. Crosby Baker brand. ~$20.

I think I looked online once a while back and couldn't find it in bulk. Odd.

[edit] just google Fermcap S 500mL and you'll get some hits, like this one: http://www.brewstock.com/product-p/9832a.htm. Yes, there's a picture of a barbed fitting, but the description is right.

 

I would prefer Fermcap AT or something that isn't silicone-based, but Fermcap-S will work if nothing else.

 

BTW, I have BSG, not Crosby Baker. Just looked.