As one of its daily deals, Amazon offers the D-Link HD 180° WiFi Network Camera for $89 with free shipping. That's the best deal we've seen and the lowest price now by $31. Features include 720p recording, night vision up to 16 feet, 8x digital zoom, and a microSDXC slot.
Reforger via Amazon offers Prime members the open-box D-Link AC1200 Dual-Band 802.11ac Wireless PCI Express Adapter for $17.99 with free shipping. (If you don't have a Prime account, be sure to select the option that's not fulfilled by Amazon to score free shipping.) That's $20 under the lowest price we could find for a factory-sealed unit elsewhere. It features two external dipole antennas.