I have been searching online to order the Petzlife gel & spray and it seems like there are so many different prices. Does anyone have the secret on which place has it the cheapest? I realize I will have to pay about $5 for s/h but I just want to get it for the best price possible. I have heard it is best to use both the spray and the gel. I can't wait for my pup to have better breath. Thanks for your help!!!