What are the speakers mainly discussing?

M: How do you and your housemates like the co-op? I’m thinking of joining it myself.
W: We like it quite a bit. We got some very fresh produce and both staples at fair prices. But the co-op doesn’t carry everything. So we still wind up going to the supermarket too, for cleaning supplies, batteries, that sort of thing. I wish the co-op solved those items. I’ve been talking about it with some of the other members.
M: What do members have to do? Just pay a membership fee?
W: Yeah. There’s a fee, and there are meetings. But attendance isn’t required. But we do have to work there for an hour every week.
M: I wouldn’t mind working there sometimes. But is the food free of additives? That will be the main reason I join, I’m a convert from junk food.
W: Well, a lot of food is pure and pesticides-free.
M: I’d like to try it just for a month or so. Do they have trial memberships?
W: The shortest membership is one month. Then if you like it you can join for a longer period. And it becomes cheaper. A six-month membership costs as much as five individual months.
M: Sounds pretty easy. Maybe the next time I run into you again it will be in the checkout line at the co-op.