Do they sell paper towels and toilet papers by the boxes and do you have to be a member to shop their.

Yes and you have to be members

Yes and yes

They sale bulk sizes. Of everything. You got to be a member yes or come with a member. But the guy above is right they do have some things to order for non members online. You can maybe fine Groupon deals on memberships since youre not a member.

Of course they do. You need membership. Costco.com allows nonmembers to shop certain classes of products with a surcharge. Best is call your local Costco.

They sell in large quantities, not sure what you mean by the box. Yes you have to be a member