You could always get the struts yourself, and save money on them, but if you do that then whatever shop you get to do them most likely won't be happy, and they may not want to offer a warranty on the work, as they charge a significant markup on the parts price to afford being able to warranty the work.
If you want a softer ride I'd consider the struts not listed as professional, they cost more, but is a soft ride is what you want, it would be worth it to retain the soft ride.
You will play twice as much though, which according to RockAuto all 4 struts will come to around 590.00
Shops tend to markup parts close to 100%, if that is the case then expect those 4 struts to cost you close to 1,200.00
I am guessing 3-4 hours labor on installing them, could be wrong there, just I have heard some places charge around that..
I'd figure 70.00 to 100.00 per hour for that labor.
So it could easily be around 1,500.00
Maybe even 1,600.00, because after replacing all four of them I'd get an alignment done..
Let them know which parts you want though, and get some estimates, all I can do is guesstimate based on what some others have charged in the past..
Too bad you do not have a mechanically inclined friend, replacing struts is not really that hard, not with the right tools...
2006 Pontiac Grand Prix GT with SC
1996 Buick Park Ave NA