On June 8th, 2012 1800petmeds.com accepted all the following as valid codes:
WEBC5 $5 off
W5PER 5% discount off purchase price
RY8 10% discount off purchase price
Only the highest value code will be applied (saved $20.99 at 10%). Plus standard shipping is free over $39. Access the site through www.ebates.com for an additional 6% cashback (except for prescription medicine and prescription items).