white knight

I got q quote from sewel lexus for $670 for 4 springs and struts, is this a good deal ??

I thinking about change the spring because the rear is lower than the front now, even with no load on the car and emplty fuel tank. The different is not much , maybe 1 inches lower , but you can see it easy by standing outside the car. SO do I still need to change the rear spring only or change all 4 to make it balance ?

thank Blake for helping me out, now I only need to search for the discount code.

My car is 1995 ls400 and it has 150K miles on it. Still run smooth and strong and problem free. I feel it time to replace strut and spring. The rear end dip a little more than the front every time I hit a dip and pot hole. I called Sewell Lexus and they quote me for the front $110 for strut and $ 154 for spring for the rear $ 108 for strut and $ 110 for spring. Total over $1050.00 just for parts I search the forum and I see people get them for only$ 55 a piece. How and where do they get them from ? Please help, I am apperciated