The German clubs are not allowed to sell or gift. Members pay a membership fee and are in return allowed to share the crop of their three allowed plants with other members.
This is basically how it works in Spain as well, you don't use the words "buy" or "sell", but you contribute financially to the club treasury and you may withdraw that deposit in suitable amount of weed. You don't hand over cash to the person behind the counter, as an example.
You're not there to "purchase", but the effect is the same.
