Skin fungal infection

Hi-

My Pom was diagnosed with a fungal infection.  I brought him to the
vet a couple of weeks ago because I noticed a scab on the end of his
tail, which he was chasing, and then I noticed 3-4 scabs elsewhere on
his body.  During the 10 days while the culture was, well, culturing,
I gave him antibiotics and an antihistamine (which we got from the
vet) and have been shampooing him with special shampoo.  I also had
his hair cut down so that now he looks like an Ewok--this just makes
it easier to monitor the situation and makes it easier to shampoo him.
 The "scabs" have cleared up and he has stopped chasing his tail
around and he seemed quite back to normal when the vet calls and tells
me it's a FUNGAL infection (culture was done culturing by then), and
prescribes medication that is going to cost $60 and I have to drive 25
miles to get it! (Of course, I realize that the cost of the medicine
and its distance from my place isn't the vet's fault.)

I'm leaning heavily towards NOT shelling out another $60 (in addition
to the $175 office visit costs).  I'm thinking there must be something
cheaper than this that can do the same thing.  Anyone have any ideas? 
I looked at past posts but didn't find any solutions.

TIA,

Lesley