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Do you remember the brand of that speaker ?
Or are you referring to the Harmon Kardon Aura Wireless Speaker ? See here --> http://www.apple.com/shop/product/HD915VC/A/harman-kardon-aura-wireless-speaker-system
If so, that is a luxury type speaker and costs $399.99. You can purchase it from the online store, from the above link.
If this is not the model you are looking for, please let me know and I will find the right model and price for you. If you have any questions or would like any additional information, please don't hesitate to ask.
Remember, this is not my final answer. If my solutions didn't work please don't rate me bad or poor. Instead please reply back to me and I will continue to help you until we fix the problem or you are satisfied.