We often get this question on our Facebook page.
You cannot buy it in any store. Sony Rolly production is Discontinued and you can buy only used Rolly on Ebay, Amazon and other online marketplaces.
We were thinking about making one page on our website where you can find all active sales... but there is only one that we find now days: http://www.amazon.co.uk/Sony-Rolly-Player-Bluetooth-Black/dp/B002IK6ZIQ
The price is quite high (£239.99) because of rareness of device. For all lucky owners of Sony Rolly we created this website with hope that you will participate with motions that you created. Soon we will create some basic tutorials about how to use Sony Rolly and how to use Rolly Choreographer for creating motions.
Enjoy in motions and keep Rolly alive ;)