Just wondered where I could buy one of these?

LD

 

Obviously it was supposed to be a knocklink

 

There is/was a group buy going on here. Looks as if t may have closed now, but it's perhaps worth contacting the g/b organiser to see if they can point you in the direction of their supplier. Just occasionally suppliers will pass on a discount if you talk around the subject of "just missing the group buy" etc. No guarantees, but worth a shot.