Japanese Ninjago mini sets

[bigkid24]

Sorry if this is old news, but I saw a preorder for these little impulse type sets from Japan for Ninjago. Was thinking about ordering some but it seems like Japan doesn't get too many things that the US doesn't. So I figured I'd ask you experts whether or not you've seen similar sets here in the US?

I like the Jumping Snake and Hidden Sword sets.

[cvc1968]

I have seen some of these for sale on Bricklink, and I have been told they have shown up in some TRU's in the US

[mooslug]

I picked up the first one, Ninja Training, last fall/winter at a Wal-Mart. It was a poly-bag. I expect the other 3 will make their way to the US at Wal-mart/Target/TRU eventually.

[alorian]

I got the Jumping Snakes one at Wal-Mart in Maryland right before Easter, and the Ninja Training one I think around late fall like mooslug did.

Really want that Hidden Sword one.

(also my Jumping Snakes set came with two snakes, not one like in the pic. It's a big piece for a bonus, so I don't know if that's standard.)

[mooslug]

Found the go-kart set in a Wal-mart today. They were in the bin with the new Star Wars poly-bags.

Hopefully the other two will show up before too long!

[MrCRskater]

Saw these floating around Walmart in the weeks leading up to Easter, along with 3 different Friends polybags and the Star Wars polybags. I haven't seen the hidden sword set, but would love to nab one of those!

[cvc1968]

Has anyone seen any of the need 2012 sets that are set to be released in June?
I see several listings on eBay for them, but wonder if they can be found in the stores?