We have bought all of our own wine for dinner, and prosecco for toasts & welcome drinks, & we weighed up going to France but in the end bought it all before Christmas when Sainsburys had an offer on.
We bought 48 bottles of wine & 36 bottles of prosecco for £360, so worked out at £4.29 per bottle across the board - I ordered it on click & collect & did get some funny comments from the guys when I picked up, but I think the offer was 25% off all wine plus the bottles we bought were discounted too, so we've got some good quality wine for a great price. It's all sat in our garage & so far we've resisted temptations to drink any of it! We just need to get some beer now for welcome drinks & some soft drinks.
I wonder if the supermarkets might do similar offers again before Easter, depending on when your wedding is?
For us convenience played a major part in our decision because we don't get that much time together at weekends so it was easier than taking a whole day out to go over to France. We did also consider Costco & Majestic Wines too.