The cheapest I've seen them.. I suspect the price has dropped a bit due to the new IP65 version coming out…
I've purchased a couple of other Victron items from this eBay store recently, all good, well packed and fast shipping…
Website: https://www.victronenergy.com/battery-monitors/smart-battery…
Datasheet: https://www.victronenergy.com/upload/documents/Datasheet-Sma…
Manual: https://www.victronenergy.com/upload/documents/SmartShunt/Ma…
This version versus the new IP65 version: https://www.youtube.com/watch?v=x3dUwlPcwEw
Off-Grid Garage: https://www.youtube.com/watch?v=9AjndVSmyEo
Will Prowse: https://www.youtube.com/watch?v=_GjcGZsK4fI
Other vids: https://www.youtube.com/results?search_query=Victron+500A+Sm…
FYI - the seller is actually springers.com.au. In all my dealings with them I've found them to be an excellent company with best prices and great service.