Just because it's dropping doesn't mean it's still in demand. A lot of people who merchant rare items look at this as a huge opportunity. Less people are sniping them because of the price drop, it's just a matter of time till a few merchants start buying them out again.
The street price I'd say is 90m - 100m when it's in the 80m range. It's always usually 10m - 35m higher than the G.E. price. If you have one, keep it and you'll thank me later.
As far as crowns are concerned, I've seen them range for 35m - 40m street. This is as of when they where 6.5m.
@brawl boy
You could create junk and sell it with the crown to make more money. There's many free junk making methods out there, so each crown you snipe depending on the junk you can obtain quite a bit of money. For 30m - 40m in junk you'd make around 10m - 20m (as I said depends on the junk) per crown.