Talk:Plastids/@comment-142.167.91.114-20140917052951

Although they have a chance of not dropping at all, a good run of three minutes or less on Titania, Uranus (against Tyl Regor, who can be dispatched or reletively quick) can yield 40 - 100 Plastids (without Nekros/ Desecration). And if you happen to be looking for Gallium as well, you can sometimes get 2 or 3 of those, on top of some reasonably common Polymer Bundles.

I say this only because the other options can seem to take a while sometimes, especially if the enemy spawn rates happen to be low.