I have always found PI to be cheaper than JC Penny's Sears....
Don't recall the code, but what I usually do is order the $10 package ($9.95) of my portrait of choice...that gives me the large photo and all the various sizes. Plenty for Distribution.
Then I usually order about $70 worth of pics. Usually at least 3 poses so that I get the CD for free. That way I have all the images of the session and even though it costs more to print them later, I at least have that option.
I don't recall what the set prices are. But the SAME qty of pictures at Penney's or Sears would cost me $150 or more minimum and I would have no CD. Sears, their equivilant to the $10 package was not on pose of choice. It was ALWAYS the first pose, period.
For me, I like the flexibility of the poses. I found the other stores too formula based and not as easy to work with unless I had the manager taking pictures and she would always bend the rules.
I have gone often enough that I am a pro at narrowing them down. First I drop all shots that are just bad. Poor lighting (it happens!), eyes clothes, doofy expressions, "hey look--over there" (kids looking in 12 different directions) that sort of thing. That is my speed round. Then we go through the "which do you like better, this one or that one" of the similar shots. I ignore all the sales spiels that may or may not happen warning me if I drop another pose I miss out on this $300 purchase.

Then I go and compare different poses to see how I like my kids better. Basically cutting it down to 4 total poses--1 for the package and the 3 extra.
I've never experienced issues with waiting. But I do think they are worth it because when it is your turn, they don't rush us through the session unless I request it.
Also---depending on the size of your group, IME, the studio at PI can better accommodate a large group. The last time I went to JC Penney's, you would be lucky to fit more than 4 in a photo. (Each studio is different though and some may be larger.) But every PI I went to could accomodate 15-20 people easily in a shot.