At U Pull It it is $100 for a diff drum to drum so you don't even have to remove the centre just take the whole lot.
When I go there I look at the overall condition of the car to give me an indication of the condition of parts. Check the kms its done, etc. If any of them have car club related stickers on them I steer clear, if they have had fender mirrors steer clear. Its a sign they could have been thrashed. I know it sounds stupid but its just what I do.
Also, be mindful some vans have different diffs to the sedans etc. Pays to google :glare: