After I posted to the other thread on mole control, I thought I would do some checking into sources for Castor Oil (mole repellent). Here's what I found: This place: http://www.chemlab.com/ has Castor Oil, USP for $70.00 for 5 gallons. Thats $3.50 per quart. (Go to Soap Making and then Chemicals) This place: http://www.columbusfoods.net/vegetableoils/price_list.html has Castor Oil, USP for $95.36 for 6.5 gallons. That's $3.67 per quart. This place: http://www.deer-busters.com/molrep32ozre.html has a mole control that sells for $19.95 for a 32 oz or 1 quart container. It's 100% pure Castor Oil. That works out to around $400 for 5 gallons of Caster Oil!!!!! Holy S**t! I think Mole-Med is priced similar. So the point is that if you buy Castor Oil from a chemical supply house, your going to save alot of money. I'm sure that they would have MSDS sheets available. To make the Castor Oil more effective, you can add a surfactant to it, which I think Mole-Med already has in their pre-mix. For you pros, I'm not sure how far you can take this to stay within the bounds of an applicators license, but I thought I'd post the info for any help to stay competitive$$$.