Op Shops Melbourne NE - Plenty

Heading further North from Greensborough, firstly East towards Diamond Creek then turning North onto Yan Yean Road, you'll find the Re-Use shop on the right hand side just past the big pylons and high-tension power lines crossing the road.

Map of Plenty Re-use Shop - adapted from Open Street Maps

It's at the site of the old council tip, and the property still had council facilities - recycling, dog pound etc.
Here is the view from the North -you enter through the gates where the big green -and-white signs are:

The 'shop' is the pink shed just inside the gates, on the right. You can park behind the shed.

There's a fenced yard behind the shed with all sorts of larger/outside stuff, and inside is crammed with assorted bargains.

This shop is run by the Green Wedge Christian Community (as is the Hurstbridge Op Shop).
Service is cheerful and prices are cheap - it's a real treasure trove of who-knows-what.

Note that it's only open Friday-Monday inclusive, 10am - 3pm.