A while ago here, somebody advised me that these modems sometimes come up for sale at eBay as I want to have a spare.
I set up an email notification and have had about 6. I would not touch them with a barge pole. All no returns, all used and as they seem to belone to OR - not legal to sell as not owned by the seller.
I would be happy to consider any kosher sources.
Stress - the condition brought about by having to resist the temptation to beat the living daylights out of someone who richly deserves it.