Been there done that
Some years ago, I was the "supply specialist" for my office, one of many offices of a federal agency, and had authority to buy where ever I could get the best price and delivery time. Then some senior executive at HQ got the idea of having negotiated contracts for all of our supply purchases and made their use mandatory... Almost invariably, the contract price was 10-20% higher than I would have had to pay by having a local supplier, even a store from the contractor's national retail operation. but hey, we got free delivery most of the time. With the contractor's retail side, I could just go to the store, a 5-10 minute drive and have the product immediately. With the contract, I had to call the contractor's national number, go through the rigamarole with the operator, and wait 3-5 days for the shipment to arrive from their regional warehouse. Now, it's even worse for my replacement... before she can place the order (even for a case of toilet paper or box of pens), she has to go through three (or is it four?) levels of managerial approval, all online, wait for the approval to come back when each manager gets around to answering his/her email, THEN make the telephone call. It has sometimes taken a week to get the final manager's approval because the manager was out of the office.