98 expedition 2wd rear airbag suspension

[timdave1]

Howdy folks,
I have an 98 EB with the rear suspension dropping down, it did it once before on the way to work and started working again on the way home later that day. Had it checked and they could not find anything wrong, but suggested changing the airbags at a cost of almost a thousand dollars. That was over 2 months ago.
Now this morning it did the same so I think I will go ahead and get the parts and have a shop put them in, but I'm confused as to what I've seen as parts cost from a few of the suppliers from 85 bucks at Firestone to under a hundred at some of the other suppliers online.
Was I getting that raped on the deal? And is there anything particular to watch out for when doing this replacement. ie, I've seen couple of posts regarding control modules.
Thanks folks,
Have a peaceful day if you can.

[phantom_smack]

It could be a vent sticking on the air suspesion compressor.Some shops just replace everything but a good shop should be able to figure it out correctly.Prices for airbags vary greatly get a quote in writing and see exactly what they want to change.