Bottle Company South.
Ring up to check delivery costs but I ordered enough to come on a pallet last year as worked out better.
432 8oz hex with lids currently approx 37.5p each plus delivery.
384 8oz round with lids approx. 37.2p each
336 275ml 'hero' (approx. 12oz) round with lids approx. 37.11p each
336 12oz hex with lids approx. 42.6p each
Delivery for first unit in above quantities £32.50
Delivery if ordering multiples of above units £55.00 flat rate.
If you buy 1000 jars, £55.00 adds 5.5p a jar.
Prices as currently shown on their website.
It's a lot of jars but if you don't have many colonies yet have storage space and plan to keep bees a while or can club together with other local beekeepers it should work out cheaper.
https://www.bottlecompanysouth.co.uk/jam-jars-c-74.html
Other factor:
Per oz cost of the above, 12oz round hero ones make more profit when selling honey in them.
E.g. If I sell honey in 8oz at £5 or 12oz at £7.50, the 12oz round jars are about the same cost to me as the 8oz options so I'd make marginally more profit with the 12oz jars. Providing I sell as many as I would if they were hex.