My experience with purchasing the Orvis Mirage IV spool from Fin & Fire Fly Shop was top-rate. I called, a gentleman who spoke clear English promptly answered the phone, promptly checked their inventory, and told me if I ordered the spool it would be shipped that afternoon. I received the spool in 3 days.
I had previously tried to order the spool from Orvis but was going to be early September before it would be available.