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The best price on the Roomba Virtual Wall Unit is currently at Amazon.com.
Amazon.com has the Roomba Virtual Wall Unit on sale for $29.99. Ground shipping is free on orders over $25 and Amazon.com only charges sales tax in WA and ND, making this is the lowest TOTAL price currently available.
Description:
The Virtual Wall Unit allows you to keep Roomba cleaning where you want it. Creating an invisible wall up to 13' long, the Virtual Wall Unit limits Roomba to one room, one section of a large space, or keeps it out of trouble spots without you lifting a finger. The Virtual Wall Unit requires two "D" alkaline batteries (not included). Additional Virtual Wall Units give you more control and more flexibility. The virtual wall is compatible with all Roomba models. | 
