I've never been able to buy a brand new computer. It's their any good sites besides ebay that sell second Hand Apple laptops? Most intense thing I play is WOW. So I don't feel like I need the best of the best. Does anyone have any suggestions for myself who wants to get a MacBook?
Apple has just recently transitioned to an entirely new CPU architecture and they did that because the old architecture was starting to get pretty shit especially for gaming.
So unfortunately I don't recommend buying anything too old. You want an "M1" as a bare minimum and preferably with 16GB of RAM. It probably won't be as cheap as you were hoping, since the M1 is a fairly recent model. Anything older is a waste of money in my opinion.
Apple has two laptop lines, "Pro" and "Air". Both will run WOW perfectly fine (if they have an M1 or newer). The Air is going to be cheaper unless you find a really good deal on a secondhand Pro.
As for where to find them - I'd start with Facebook Marketplace.
There are anti-theft features built into all Apple products. The seller will need to unlock the laptop before selling it to you. DO NOT buy anything from Apple that hasn't been unlocked. Aside from potentially being stolen, the lock cannot be bypassed. You'll end up with a computer you cannot use.
While there are ways to remove activation lock, it is either with the method you posted, or by providing Apple with a copy/scan/etc of the original (i.e., the one that matches Apple’s records) purchase receipt, that must also clearly show the device’s serial number.
Did you provide Apple with the receipt you got from Amazon when you purchased them? Or did the original owner provide you a copy of the receipt when they purchased them?
Because before Apple will remove activation lock they would want to see a copy of the second.
Apple doesn’t give a shit about the receipt that shows you purchased second-hand, they only care about the receipt that matches their records of where the device was originally sold.