Reco biz for selling iPhone 6s Plus

Hi!
I'm interested in selling/trading in my unlocked iPhone 6s Plus 64GB (Good condition), not to a person, but to a business. Does anyone have any experience with any company, online or otherwise? Where would I be able to get the best trade-in/sale value?

Some sites I've found with a quick Google. Any other to recommend that service us Canucks?:

• https://www.getorchard.com/
• ($200) https://www.apple.com/ca/trade-in/
• ($150) https://gorecell.ca/
• ($110) https://www.bestbuy.ca/en-ca/event/trade-in-program/
• ($117) https://www.gizmogrind.ca/
• ($141) https://www.spherethat.ca/