Sure the shingles run a bit over $100 a sq , but you need felt paper , drip edge , flashing , coil nails , misc supplies , delivery , disposal costs , labor , insurance , sales commissions , overhead , whats left is profit , and it it runs around 20% . 

Thirty (30) calendar days are reserved for delivery and notification.3.

My target IRR for my investors is 15%, but I am only doing deals, where I realistically think I can get to 20% (under promise over deliver is the goal).

Now you are left having to go to another distributor and keeping track of multiple accounts and deliveries which interrupts your business.2.

Delivery of equipment was complicated in Chicago city lots.  

Are you going to have the most nervous delivery of a deal? 

Two benefits to first class 1) faster delivery, 2) free forwarding and return, 3) a belief that it is more likely to be looked at by recipient.

In Georgia (the state where I'm licensed), you must either be a licensed broker or an unlicensed assistant to a broker in order to perform any of the following functions on behalf of a property owner: (A) Delivering a lease application, a lease, or any amendment thereto to any person; (B) Receiving a lease application, a lease, or any amendment thereto, a security deposit, rental payment, or any related payment for delivery to and made payable to the broker or the owner; (C) Showing a rental unit to any person, provided that the employee is acting under the direct instructions of the broker, and executing leases or rental agreements; (D) Providing information about a rental unit, a lease application, or a lease; (E) Providing information to a tenant about the status of such tenant's security deposit or rent payments or to an owner about the owner's financial accounts and payments from the owner's tenants; and (F) Performing any ministerial acts that are explicitly authorized by the broker in a written agreement between the broker and the employee.

The real cost for the building(s) themselves run between $65 for a shell delivery up to  $85 psf or higher for a vanilla box.

You can buy at a discount and then schedule delivery for whenever you are ready.