I have found a place that sells the H-harness with the snap clips instead of
buckles:
Ferret Outfitters
P.O. Box 394
Red Creek, NY   13143
toll free # 1-800-440-3356
They have harnesses in 9 various colors, as well as other ferret products.  I
just ordered the catalogue so I cannot inform you what else is in the
catalogue.  I know the clip H-harness ( with the detachable matching lead)
costs $14.99 w/o tax or shipping and handling fees.
[Posted in FML issue 1254]