Electric weed killer (Riverdene RG21)

I know this is a long shot, but they have worked before so fingers crossed. Does anyone have please an electric weed killer they do not need anymore?. I find it hard kneeling in the garden and the weeds between my paving stones have gone wild. The picture is just for reference any make or model would be so helpful. It would allow me to keep on top of the weeds. Thank you all for reading, can pick up at anytime to suit you Regards Anne