I was also lucky enough to find a shiny blue dusty polish at Kmart, this lovely blue-pink duochrome Blue Brilliance. It came out last Spring, and I'd missed out on it in Colorado, only to find it here in Charleston-- woohoo!
It's actually very sheer and best layered, and the duochrome isn't that visible, but I've been super obsessed with blue-pink duochromes due to my unquenchable lemming for OPI's Sugarplum Yum. AGH it's so pretty, why don't we see more amazing duochromes like that?!
The next day I think I received an online order with a few polishes including Essie's Lapis of Luxury, which I then realized is basically the same polish as Barefoot in Blue-- ah well! But wait, there's more: I had also recently picked up a new color by Sinful Colors, Morning Glory, which is practically identical in color but has a glass-flecked texture instead of a creme. I included some bottle and swatch comparisons so you could see for yourselves.
I must really like this color if I've bought it this many times, so I feel like I'm going to get good use out of it on it's own as well as layered over.