You can get this as early as the Poison Ivy fight which is very early in the level if you have some of the previous DLC packs and the double studs multiplier as usual. Gabby from the Ghostbusters story pack has an interactive spot to power up another area for plenty of studs, and there are 3 large silver tanks that needs to be blown up for some more studs.
This is pretty early in the level and there is plenty of time to get more studs after this point. This is for those that want to get the collecting over with right away.
If you forgot how to use the Taunt-O-Vision, you place it on the pad, press B to pick it up and drop it, and when you remove it from the base it will explode.
Here is a list of everything that can destroy silver objects:
http://www.brickstolife.com/lego-dimensions-abilities/silver...