I visited 3 stores looking for the pixels 7a. One of these stores (best buy) sells it at a 20% discount for only 2 weeks, brand new, 128 GB, so I may go for it to buy and nuke to install graphene OS, then relock it.
A poster suggested me to avoid verizon, because they lock the bootloader to prevent you installing anything else.
This one seems to be a pixels directly from google: on a table displaying other google devices and earbuds, but I wouldn’t want to buy something I cannot relock on non-stock software.
ETA: what port does it use for charging?
You don’t need to worry about whether it’s relockable, but it’s important that it can be unlocked in the first place. Just don’t get it from a carrier and you’ll be fine. Buy the phone from some store like Best Buy.
To answer your second question: It uses USB-C.