I emailed them last week when I noticed that they were showing HM300s as out of stock (vs not even listing them). I emailed DSS CS and they let me know that they were expecting three sets in a shipping container last week. I cancelled my order of HM341s and ordered the HM300s. The HM341s were ordered a year ago but haven't been available since. At that time I settled for the 341s as DSS wasn't sure if they'd be getting HM300s again.
Found out that their container arrived late last week and just got a shipping notice from them.
![Grin ;D](http://forums.sohc4.net/Smileys/default/grin.gif)
There may still be a couple of sets available. If you really want one of the sets it's likely worth ordering and paying for them and then contacting DSS CS to see if they other couple of sets are still available (but not listed yet). I suspect that if they haven't been sold yet that they'll be listed as available on the DSS site soon.
I just got lucky with my timing. Usually doesn't happen that way for me.