Did you find a remover yet? If you can't find one at a reasonable price, say less than $15.00, you're better off letting a dealer or co-op remove it for you, at a cost of $5-10.00.

Or if you have access to bench grinder here's how you can make your own remover for a buck or two. You'll need to remove the axle cone and locknut from the left, then slide the axle out to the right, and recover the loose balls (or buy new ones).

Now bring the wheel to a decent hardware store and look for a square or hex head bolt that is a jam fit into the splines of the freewheel. If you're lucky you'll find one, but most likely will buy the nearest bolt larger. Grind the faces until you can just jam it into the splines, then grind two flats into the shank just under the head so you can hold it in a vise.

Jam the bolt into the freewheel, mount in vise holding by the flats, and turn the wheel to the left. Don't be surprised at the amount of torque needed, it'll be a lot, and the spokes may creak or ping, but if you did a decent job making the remover the wheel will spin free.