Just saw this on my Nectar Site, seems like a good offer especially with the festive season coming up.
Double points on next 9 visits & bonus 100 points on 10th visit.
Collect bonus points on your next 10 swipes at Sainsbury's. Valid in-store, online or on fuel.
How to get this offer
Click 'Load to card' and swipe each time you shop
Collect double points on your next 9 shops and 100 bonus points when you make your 10th shop until 04/01/2017
Points will be awarded within 28 days