As you know, I'm not a pro. But, when I had my master bath remodeled, they used Wirsbo pex to do it. I linve in a multi-family dwelling (a townhouse condo) and in our city, you can't do your own work on plumbing or electrical in them, only in single family houses.
Didn't they change the name of the company awhile ago? If the packaging still says Wirsbo, that may be the reason they are dropping the price so that they can get the inventory to represent the new name.