W124 300CE Calipers

[glenmore]

The pads on my right brake were making a hi-pitched squeal so I pulled them to re-apply some anti-squeal paste. I noticed that one pad was much more worn than the other. A search of threads suggested sticky pistons. A less common fault would be a brake line pinched by old age. Since it was time for a fluid flush I did that along with changing out the brake lines which probably were original. On one of the front lines there was a little bit of corrosion at the caliper end of the brake line. I understand that rebuilding calipers is extremely easy...if there is no corrosion. Someone posted brakewarehouse.com as a source of rebuilt calipers and that the low cost of rebuilts makes rebuilding them yourself a waste of time. Is this accurate? Any other suggestions?

glenmore
1991 300CE 138M