Found these on clearance today at Lowe's (Fayetteville ,AR) normally $49. I didnt see these online and I am a noob so not sure what else to include really. Something to keep an eye out for though. I am assuming extreme YMMV.
UPDATE 08/28 I just found a 30LB box of 16d 3-1/2" exterior galv. ring shank patio/deck nails for $20! Well they were actually on clearance for $29.99, but the container was pretty beat up and an i asked the employee that greeted me if he wanted to sell them for even less cause the box was messed up and he told me that yeah, they can do that. Took an additional $10 off for me right there.
Store page for the 16d nails...
I now have 80lbs of nails ive bought that i didnt need in the last couple of weeks...
QA Note: Link to Product Page [lowes.com]
(for reference only, deal in in-store only)