Eufy's Prime Big Deal Days sale gets a subscription-free security camera on your house for $49.99. That's the EufyCam C35, half its $99.99 list price, and it leads a long list of cuts on Eufy cameras, doorbells, smart locks and outdoor lights. The deals run October 6 and 7 on Amazon, and you'll need a Prime membership to get them.
Almost nothing here needs a monthly plan, and that's the point. A cheap camera that comes with a $10 monthly subscription stops being cheap after a year or two.
Cameras

If you want the simplest possible setup, get the C35. It mounts magnetically, needs no drilling, and Eufy says its sensor gives color night vision without a spotlight. If you'd rather cover a whole yard with one camera, the C37 pans and tilts 360 degrees and follows whatever it's tracking.
- EufyCam C35: $49.99 (was $99.99) Amazon
- EufyCam C35 four-camera kit with HomeBase Mini: $189.99 (was $349.99) Amazon
- EufyCam C37 (2K, solar, pan and tilt): $59.99 (was $99.99) Amazon
- EufyCam C37 four-camera kit with HomeBase Mini: $259.99 (was $449.99) Amazon
- EufyCam C37 4K four-camera kit: $399.99 (was $599.99) Amazon
- Eufy SoloCam S340 (3K dual-lens, solar): $119.99 (was $199.99) Amazon
- Eufy Wall Light Cam S4 (4K, solar): $189.99 (was $249.99) Amazon

The four-camera kits are the better value if you're covering a whole property. The C35 and C37 kits come with a HomeBase Mini, which according to Eufy adds facial recognition and tracks people from one camera to the next. The Wall Light Cam S4 is the most interesting of the newer models: it uses 60GHz mmWave radar for motion detection, which Eufy says cuts false alerts from pets and plants.
Doorbell and smart locks

- Eufy Video Doorbell E340: $99.99 (was $149.99) Amazon
- Eufy Smart Lock C33 (fingerprint, keypad, Wi-Fi): $99.97 (was $169.99) Amazon
- Eufy FamiLock S3 Max (palm vein, built-in doorbell camera): $279.99 (was $399.99) Amazon
The E340 has a second camera pointing at your doorstep, so you can see the parcel as well as the person dropping it off. It has 8GB of built-in storage, so there's nothing to pay monthly.
The FamiLock S3 Max puts a lock and a 2K video doorbell in one unit. Eufy says it unlocks by scanning the veins in your palm in 0.6 seconds, and it supports Matter.
Permanent outdoor lights

The Permanent Outdoor Lights S4 100ft kit drops to $284.99 from $499.99, which is good timing with Halloween and the holidays on the way. It uses 72 LEDs mixing RGB with warm and cool white, can be cut to fit your roofline, and uses radar to switch on when someone walks up. Eufy says it can produce up to 281 trillion colors, which is a lot of options for a Christmas display.
The verdict
If you're starting from scratch, the C37 four-camera kit at $259.99 covers most homes properly for about $65 a camera. Anyone who just wants to see who's at the door should get the E340 doorbell at $99.99.
All of these are Prime-only and end on October 7, so don't leave it until the last evening.