bookshop.org is operated by Ingram, which is generally the wholesaler to bookstores but also has a large online order fulfillment business. The upside of this is that Ingram is a logistics specialist and has the ability to ship very quickly and reliably---and so bookshop.org is in a way the best of both worlds, as it pays the local bookstores via their Ingram contract while also leveraging Ingram's order fulfillment business to get things shipped quickly and reliably.