40lb? It's nothing... I've ordered tires over years and I bought 6 tires back in one-shot (2 for my friend, 4 for me).
I have been using The Letter Carrier a bit, and they are raising their prices soon. So you can consider P2P or TSB again. Most of my stuff has tracking # so it is not that important to get notifications.
They have ample of parking down there.
About custom, I never have an issue. I bring my Nexus with me so going into PR is easy. Coming back is just joing the queue if I want to get a tax break.
Philip |