Gmail Plug is one of the platforms you can buy verified Gmail accounts from. Currently, Gmail Plug is based on Discord, but plans are on the way to create a standalone website for the service. If what you are looking for are Gmail accounts that work, then Gmail Plug is the service for you.
One thing you will come to like about Gmail Plug is that they have support for groupbuys and discounts for bulk orders. Gmail Plug is the place for buying optimized primed accounts for Captcha solver. You can visit the Gmail Plug page on Twitter via the @GmailPlug handle.