Found these on Amazon today reduced to a bargain price of £18.99.
Flexson make superb accessories for Sonos, these stands are of great quality and should improve the sound of your already great sounding Play1 speakers, whilst also looking superb.
Lowest price I've ever seen these and also the lowest ever price on Amazon according to Camel.
They typically retail for £35-40, so grab yourself a bargain! Amazon are still selling a single stand for £19...