The poster here (who I think by no coincidence also lives in Michigan actually--not exactly the safest place to ride), was the individual I was referencing that was looking to sell. I thought there was a decent chance ItsJustMe already sold it, but thought I'd mention them anyways.

Regarding the Google Alerts, I thought I'd note and correct my recommendation here.

I haven't used it much and unfortunately, it will only send alerts regarding content that falls within certain categories (which I'm not certain of what those categories are). As far as I can tell, it doesn't work like a selective vacuum, bringing up anything on the web that say matches a specific Google search (which would be nice). My Google alert that I had related to the DS-500 didn't bring up your post for example, which would eventually come up with a Google search after however many days.

My thoughts though are (1) there might be some tool out there that does do that and (2) if there is not, then simply see if it would take perhaps one or two or even more, separate searches, copy and paste them and search for it periodically.

I'll send you a PM when I've a little more time regarding more specific searches on Google if you're not quite familiar (not that complicated really) and the same for eBay.