Looking for buying bulk .com domains

Hey, for a new project I need something like 50 .com domains every month, so I don't like the idea of buying it from godaddy (or namecheap) for expensive prices (for me, more than 4$ per domain is expensive).
I would be happy to buy 100-500 domains (depends on price), let me know if you have some way to do that.
*Used domains are also ok, and also domains that their expiry date is close.

You may go to register and 1&1 for.com domain name.

specifically .com? other tlds and gtlds are cheaper too if they work for you.

Check in marketplace section

Namecheap offer bulk domain pricing, you need to contact them for that.
Butit won't be 4$ for a domain in .com