Rabbit ear mites - is a cat or ferret solution safe?

Question
I just got my rabbit on Tuesday from a local (organic) farm.

Today he's been washing his right ear often and later today it kind of flopped over so that it rests perpendicular to the other (which is straight up).  He hasn't been lethargic (in fact he's being more active and more friendly each day!) so I don't think he's sick.
I looked in his ear and saw a bit of brown wax.
I've had cats before, and when this happened to one of them, they had ear mites.  

I haven't found any "rabbit" specific eat mite drops, but the pet store nearby does sell ear mite drops for cats and for ferrets (and for dogs).  The ferret one is about half the price of the cat one.  I was wondering if I could use either of these products.

The organic farm from which he came mostly sell rabbits for meat, but if you want them as pets, they do that that too.  The farmers were very helpful. This was the fifth local farm I've visited and I was really impressed with the care of all of the animals.  The rabbits all lived in a clean sheltered barn where the farmers opened the doors during the day and closed them at night.  The rabbits were all in big cages.  In each cage was a metal "litter" box filled with hay and there was a hay rack in addition to a pellet/produce trough (& water bottle).  These farmers only tend all of their animals (they had rabbits, chickens, goats, sheep, guinea fowl, and one cow) with organic food they grow right on their farm!  Even though this farm was great, I know  these organic farmers don't use any chemicals on their animals unless "they absolutely have to" for medical reasons.

Answer
Hi,

you will need to take him over to a good rabbit vet for examination.  You should do this with any new pet anyway, always get them to a vet soon after so that you can get a good baseline of their health or find out hidden problems (or to get an obvious one checked out before it gets worse).

Not any old vet, a good rabbit vet.  Start here:

www.rabbit.org/vets/vets.html

to find a House Rabbit Society recommended vet near you.

Do not use any of the other animal solutions on them, they often have chemicals dangerous to rabbits that can kill them.  Since you didn't specify which ones I advise not using any.  Let a rabbit-savvy vet tell you which ones are safe to pick up where you live.  In the meantime if you think there could be mites, put a little mineral oil on/in his ears with your fingers.  It will bring some relief and if he has mites they won't like it very much.  

But get to a rabbit vet, get a general exam and tell him about the ears and what you suspect, and discuss safe things to use to get rid of them if your bunny actually has them.