I bought a pair of BeoLab 3's off of Ebay and am delighted with them. They came with the tall floor stands but after a move I need to place them on a windowsill. The official donuts (table rings) are quite expensive so I looked around for an inexpensive alternative and came up with the rubber quoits!
I bought my rubber quoits online from link
I cut out a notch for the cables to run through.
The substantial weight of the Beolab 3's means they sit nice and securely. The speaker can also be easily rotated in the vertical and horizontal axes for flexibility with positioning.
All in all a very cost effective table stand at £12