where to get aftermarket springs?

I'm looking for, preferably, non-performance aftermarket springs to
replace those on my 1998 Honda Civic 4 door. I don't want a lower ride
height. I've called local auto part shops and they don't sell springs.
NTB couldn't get springs either, and they won't install springs if I
bring them in. What's up with that?

I've used my car for moving over a long distance in the past (loaded
inside to the roof), and the car is now visibly sagging. Guess I
should have rented a trailer.

 

http://www.hondaautomotiveparts.com/

They sell stock springs for your car. $59 each per for the fronts, I
didn't look up the backs. Good time to do the shocks while you're at it.
Not sure why they won't swap them, it's basically identical procedure to
putting in shocks.

With a jack, Jack stand and spring compressor. It's a 1/2 hour job per
side (for me). If you do the backs, be prepared to buy new lower control
arms first ($100 for both). Once they get some years on them, the shock
freezes to the control arm bushing. A shop can cut it loose and put in a
new bushing.

You can swap the spring without the shock in the back by dropping the
entire shock/spring cartridge and lower control arm as a unit. Then just
leave the shock attached to the arm and remove/replace the spring.