michiganjfrog , ipod nano cases do not fit the these nano-clones.
1. Ipod Nanos are 1.2" screens, nano-clones are of 1.5" or 1.8".
2. The keypad is lower on nano-clones, so the keypad cutting for ipod nano cases will be out.
Basically, any casings made for original Ipod Nanos do not fit.
If you want a silicon case,
Uxcell.com sells them. I bought mine from them not long ago, fits perfectly and comes with the armband, and lanyard.
Though eBay sells them, but the sellers are very few.