B&H Photo-Video offers the HGST 4TB Deskstar Coolspin 3.5" SATA Internal Hard Drive, model no. 0S03664, for $159.99 with free shipping. That's $15 under our June mention and the lowest total price we could find by $15. It spins at 7200rpm and features one million hours of MTBF.
If you're at least 62 years old, you can score a $10 lifetime pass to America's federal parks and recreational lands. But act quickly because fees are about to jump.