You will probably get 2 very different numbers. I just had mine replaced. Some shops will want to replace the whole hub assembly with a bearing in it (Half of the Ford dealers i have spoke with and half the outside shops I have heard of) which will present in the $500 range for 1 wheel bearing.
The best option is to find a shop to pull the hub and tap out the old bearing and press a new one in. $140-$180. I had mine done in a day by a good local shop for $150 for parts and labor (the bearing alone is around $40).
Or you could attempt to do it yourself in which case your in it for a bearing and a length of steel tube the same diameter as the outer race of the bearing (used to tap and press the bearing in with).
