I have six boxes of K9 Advantix Blue for dogs over 55lbs, four applications each box available for purchase.  This does not require a prescription and does not have an expiration date.  I am selling these for $40 a box, which includes first class postage.  I bought two cases, and I can't use all I have before the end of the warmer weather.  Maybe someone else would like to have them at this price.  Paypal preferred.  I still have some Interceptor too. Contact me privately at Cathyyak@aol.com.