Animal Welfare Professionals

Hi all, 

I am looking into the provisioning of meds for heartworm, as well as flea and tick medication for our dogs and cats at intake.  We had been using donated meds, but these are running out.  Trifexis for example is about $500 a box.  

I know that there are grants probably available for this.   Or is there a clearinghouse out there through which we can acquire expired meds?

Thank you in advance for any help!