Sears: Craftsman 5/8" x 100' all rubber hose with a lifetime warranty and working pressure of 165# for about $45.

Here is a link that might be useful: Sears Craftsman Garden Hose

Having a high pressure hose would work for one of the hydrants, but the other one is in my small greenhouse, and I want to use a small, coiled hose there, so I'd still like to know if anyone has suggestions for accomplishing an actual pressure reduction.

You could try using one of the pressure regulators they sell for drip irrigation that connects to a hose bibb. Go to the drip irrigation system section of any of the big box retailers.

The only thing to lookout for is the threads. There's hose bibb threads and pipe threads. With most hose-connected drip irrigation systems, you start at a hose bibb (hose threads). But many times, as you put the pieces together, you jump to pipe threads.

See, a typical drip irrigation kit will consist of a backflow preventer, pressure regulator, filter, and tubing adapter designed to be put together in that order. That means the Backflow preventer will have hose threads on the input. But the output of the backflow and all the other connections in the system could be either. So you might have to find some male/female, hose/pipe thread adapters.

Here's an example of what I'm talking about.
http://www.mrdrip.com/pressureregulators.htm
The standard regulator looks like it has pipe threads on the output, but the input might be hose threads. If I'm right, you would need not only this pressure regulator, but also a male-pipe to female-hose adapter. You would connect the pressure regulator directly to the hose bibb, the adapter to the regulator, and your hose to the adapter.

hookoodooku-
Thanks for the good advice. I was thinking along those lines, and needed some positive reinforcement...