[fair012345]

should I buy liquidation iPhone 6s without warranty?

[Tartarus]

I'd go and see the iPhone my self first.. Search for any visible damage, check the device's serial number with https://checkcoverage.apple.com and trust your gut instinct about the phone.

[TwitchyPuppy]

^ This

[alc1575]

Also, just in case the phone is a customer return or used in any way, the IMEI or serial number should be run through the activation lock checker:
https://www.icloud.com/activationlock/
if it's locked and no way to locate previous owner to have it removed from their iCloud account, it is an unusable brick.

[StayClassy101]

This as well.

[Honey Beagle]

eBay would be your bestest choice. But......make sure the seller has at least a 99% positive feedback. Ales that the phone does not have that annoying iCloud lock on.

[parker5011]

swappa.com

Run by eBay. Way better.

[Honey Beagle]

Never knew that. Interesting.

[talknlearn]

Make sure when you're buying it, that the iPhone 6s is 100% refundable. Sometimes the owner might sell you it with it completely locked or destroyed on the inside. That wouldn't be good right? So make sure you check the phone before buying it.