Shoulder packages are either (2) pairs of bands (novice, athletic, elite) for $195 or the pro package with (5) pairs of bands for $295 for all athletes and abilities.
I started off using the Novice, 3 and 10# bands and have recently graduated to the Athletic, 7 and 15# bands. Athletic is the baseline for most adults and high school students. The Elite package for college and pro athletes includes 10 and 25# bands.
The kits also include anchors, door belts or rack straps. I would go with anchors.
Finally they throw in a training guide, exercise chart and drawstring backpack.
They typically have 25% off sales for Black Friday, the Crossfit Open and other times of year making the $195 package $150 and the $295 package $225. Individual cords could be purchased separately for $45.
I have not seen these in the secondary market. That usually indicates they are used often by owners.
I was originally interested in the Novice package, but now I would just get the Pro Package. In theory an extra $75 is not bad for 3 pairs of bands that my wife or kids could use.