Currently cheapest price for the UE400's from any store but if you have seen cheaper let me know.
Not too sure about the other deals listed in the ad but you can check them out too.
If I have made any sort of mistake also let me know.
Cheers.
EDIT: Shipping for me was $10 so probably best to pick up.
I see that Logitect MX800 is $149. I just bought a K520, but need another keyboard for another computer. What would be the difference between those 2 keyboards?