Derick Bolton mentioned in Moving Furniture Part 1, 'Sliderz' ideal for moving heavy items.
I have just purchased from QVC (Sky, Cable, Digitel Channel)
some Sliding Robots, same idea as 'Sliderz' Item No 820256
Priced 15.94 + 3.45 p&p for 16 pieces, 8 x 6" & 8 x 3".
Hoping this is helpful and money saving.