Sarita is right- the liquid Metacam for dogs (and cats) is the same that is used for bunnies. The Baytril that rabbits take- either the uncoated purple pills (also for dogs and cats) or they get liquid that is specially flavored for bunnies (basically the medication is “compounded”- which means made specifically for that pet).
You will need a prescription to buy these meds online- and so unless your bunny is very ill and needs Baytril and Metacam long term- your vet is unlikely to write a prescription so that you may buy them in bulk. Most medication have a shelf life of only a couple of years max. And compounded medications are often only about 6 month shelf life or so.
You can ask your vet for a prescription that the pet needs- a.k.a for 1-2 weeks, whatever the vet was going to send you home with. The only disadvantage to that is that your bunny will not be able to start meds until meds are shipped to you. And considering the repuatation and reliability of on-line pharmacies my vet clinic will print a prescription for a client- but we will not fax or call it it- basically once we write it, it is your responsibility and liability to have filled from unknown, uncontrolled source. And unfortunately that can slow do the order process, but for liability reasons our clinic has to do that. (Some online pharmacies have been convicted of selling without prescription, selling meds labeled for other countries (not USDA approved then), selling incorrect amount, selling expired, etc). So be sure to order from a place that you trust.