You'll have to buy a shim kit anyway, and if you get the bearings with it it's usually a bit cheaper.
I just had mine done, and with 90K on the stockers, they were mostly just fine. I had them replaced as a matter of practice but, the point is you never know if you'll need bearings or not. Just because they're not bad when you take them out doesn't mean they'll be good for much longer. Just get them and enjoy the peace of mind that you'll get knowing you have new parts that still have life in them.