1- I agree.
2- Quick statement, probably checking only one French supermaket and not noticing that industrial products are not in the same aisle than organic products.
3- Probably not the right place to buy CDs.
I can have a 50 CD' spindle for 17,00 .
4 - Recently, French Postal Service,
La Poste, got a licence to act as a bank, with the same services. So, today, you can have a bank and the postal service in the same building but different offices and clercks.
5 - As usual, shop assistants are people with little training. That, in addition, they forget things, is obvious and not particular to France.
As far as I know, only one supermakets' chain sells the bags to pack (they say they are protecting the environment). Otherwise is common practice to pack yourself in Europe.
I hope I replied to your expectations (

).