For the smaller Zoom H1's just about any small modified belt clip would work. For the larger Audio Recorders like the Zoom H4n, I've been thinking of good ideas for a belt clip mount. These generic DSLR quick release clips have been around for a long time, but of course I'm not trusting my heavy DSLR on this thing. For something like a Zoom H4n, it should be no problem. A few different versions available, and even with the QR adapter knob in place, some still provide access to a tripod mounting hole. Might be worth a test, and the only caveat is you'll need to be wearing a belt. For those who shoot in the nude, this could be the deal breaker. Found below.
If you want to take a look at some smaller belt clips for the Zoom H1 (when using it as a body pack on your subject), these stainless steel universal clips would work well. You'll need to open up the hole a bit to attach to the tripod mount of the Zoom H1.