Does this store sell harnesses for climbing or ziplining?

Go to a sporting store. Target isn't the kind of store you buy outside sporting goods like this.

I wouldn't buy one if they did. Head to REI or your local climbing shop.

I haven't seen any in the store. Try checking online

I've never seen harnesses at the Redwood City store. I buy mine at REI or Planet Granite.

I think so but best bet would be to call or go in and if they don't have any go to big 5