Harry:

I bought TKS Fluid (Aircraft AL-5 De-Icing Fluid for TKS De-Icing systems) from:

D.W. Davies & Co., Inc.
3200 Phillips Ave.
Racine, WI 53403
1 800 888 6133  Ext: 35
loddies@dwdavies.com
www.dwdavies.com

I bought a case that contained 4 one gallon jugs.  They just mail it to you.  Should be a life time supply.

Cheers,

John