cpo-outlets via eBay offers the refurbished Ridgid R175 1-3/4" Roofing Coil Nailer, model no. ZRR175RNE, for $79.88 with free shipping. That's $170 off and the lowest total price we could find. It features a magnetic nail holder, dry-fire lockout, and full strike drive system.
A 1-year warranty applies, although it's unclear who provides it.