These coins don't come up often because of their extreme rarity.

Design-wise, they might not be as good as their normal circulated cousins - that's because the common issues are already too difficult to overdo

Nevertheless, here are two offers that's up on eBay:

1911 20 kopeks in Nickel
1916 3 kopeks PROOF!!!

Now being in the topic about trial Imperial Russian coins, this is one of the first minted overseas in Brussels.

1863 2 kopeks

Sure they are nice, that is if you can blow 2grand on each of them... and they will be all yours... considering that mintage is just below 300 (?) each if I am not mistaken.

I love the nickel coins of 1911... Wish I could afford even one some day.
But no! Oh, no...