Yep! So I did a search and since I don't know what country you're in, searched for Pixels at eBay which is where I always go. You want to make sure go to the sellers pages to see what else they offer. It's a good bet if they have a good rating and just only sell phones & phone accessories (not like, an assortment of crap as it they're cleaning out their attic) and if you find a phone you like, go to the item and click "Message seller" you need to ask them if the bootloader is unlocked - if the listing contains the word, "Unlocked" that is not enough to know, because usually that refers to whether the phone is locked in with a certain wireless carrier, not whether you can flash the ROM. So always ask if it's not clear. The full description (scroll, scroll) may also say "oem unlocked" or "bootloader unlocked". That's about all you need. Then go to Graphene web installer and it will do the rest if you connect your PC to the phone via USB. Here's an example listing:

Pixel for sale | eBay

Find great deals on eBay for Pixel. Shop with confidence.