I buy about half our groceries in bulk (Sams/Costco). Almond milk, butter, yogurt, beef, chicken, pork, olive oil, coffee, nuts to name a few. I typically freeze 3/4 of the meat bought in bulk - packaged in smaller portions and thawed on a weekly basis.

Most of the produce is still purchased from a local grocery store or farmers market (my garden has been languishing this year.) I've been considering buying beef locally as I have many local producers and butchers - just need a dedicated freezer. I don't think that would necessarily save money, but the quality is probably better and I'd rather support local producers.

If I hadn't switched to buying many items in bulk, my grocery bill would easily be double what it was 5 years ago. Having a teenage boy in the house admittedly doesn't help there.