First try Rockauto than as Richard D suggested post more info.There are a lot of good sources out there. Google your rear and put carrier bearings in the search.
Every time I used to buy cheap stuff it wound up costing me more in the long run. Now I buy the best.
I have a large box of NOS Ford bearings, and another couple of boxes of other NORS bearings. What is the bearing number you need? PM me. Rod
Bearings are bearings. If Timken made them they still make them. Go to a bearing place and they will match the numbers.
Less expensive doesn't have to mean cheaper quality, you can go to your local auto parts and pay $20 for a 88048 Timken bearing and go to a site like Rock auto and get the same bearing, less expensive for around $8.00
In Southern California we have a company called bearings and drives. Sometimes they come in cheaper for the same bearing and t time they can be more costly. Check on what numbers you need and contact them or similar bearing supply co