Woolworths Voucher through Groupon

WOW - this one is good. Purchase a voucher through Groupon for $80.00 then apply it to your order of $100.00 ( or more ) from Woollies on line to receive this 20% discount.I.e. have just placed an order of apx. $160.94 with a deduction of $100.00. Still had to pay the $9.00 delivery though :( - However the savings are good.
Offer is on throughout November but the stipulations are only one voucher per person .