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You don't need to replace the carrier to re-gear the 14 bolt, there is tons of aftermarket support with "thick" gears that eliminate the need to replace the carrier.
The 4.10 and down carrier actually has more options for gear ratios. It's the only one you can get 5.38s for, and it's usually what people are selling used gears for.
I'd say your best bet is a Pick-N-Pull-type yard if you can't find one on Craigslist.
Make sure you get an open carrier and not a G80.
I've bought from Summit and ECGS in the past with good results. Summit will price-match a listed price from a website. I felt kinda bad when I had them do it for my 5.38s from autoplicity because they were like $190 or something ridiculously low. Both of them carry crush sleeve eliminators for the 14 bolt also.