Check locally tooI was able to get my blank signs cheapest from a local bulk sign/plastics supplier 

Originally posted by @Larry Fried:@Jason Ma It is not a question of which is better, but which is better for you and your circumstances.  

Thanks @Larry Fried!

I just bought a batch of blank 18x24 yellow corrugated plastic signs.

The contractor I had used for the home back then was always proud of saving me money on material and had installed plastic shut-off valves, probably saved me $5 a piece - on 8 valves total in the house.

I am trying this concept now - she works 9-6pm Mon thru Fri, and I take all calls after 6pm and do all house showings with buyers Saturday and Sunday when most people can look at houses.

Plastic Cups treated with the product

Colonel Sanders didn't fry his first piece of chicken until he was 60. 

@Mark Fries thanks buddy.

Go a day ahead of the exterminator with a giant box of thick 50 gallon contractor trash bags and make sure the tenants but everything in plastic boxes or double tied up trash bags (be careful when you get back home).