Checking on Instacart and so including their markup, our local Market Basket has, for the veggies:

* Onions: $1.59 for 2lb

* Carrots: $0.89 for 2lb

* Garlic: $1.89 for 5 heads

* Celery: $3.09 for a bunch (~1lb)

The carrots are cheaper, and everything else is more expensive but mostly the celery. This "basket" of fresh vegetables is $6.67 vs €2.79 (2.4x). Exclude the celery and it's $3.55 vs €2.00 (1.8x)

They look about right from the UK (I'd pay more for the tomatoes and pasta in particular, personally, but certainly available that cheap) - but that has been my experience in US/Canadian supermarkets, that groceries seem expensive.