Has anyone found a cheaper source for the genuine Skoda rubber mat set, and boot liner, or alternatively a decent 3rd party set?

Superskoda is where I bought mine from. 

Edited 28 February, 20197 yr by MyPug10G

Not OE Skoda but I've had two Rezaw boot liners now, latest one in the Superb.  I've been very impressed with the quality.  Not very expensive.  Available from Roofbox Co (who are also very good to deal with):

 

https://www.roofbox.co.uk/scripts/rbvehsel2.php?emulate=carbox&query=Skoda

 

Available for hatch and estate and with the estate you have the choice of selecting a liner for a high or low position, if you have the variable floor.  Just buy the one for the position where the boot floor spends most of its time.  You can use them in the other position and they will fold/bend but soon come back into shape.