.com now has a wholesale price of $8.39, but Namecheap currently has:
$6.16 for .com
Dreamhost are selling for $5.99 (not sure if it's that BF price or some other offer).
Nominalia has 1 Euro .com.
Etc.
You can check this site, which is usually up to date with running promos:
https://tldes.com/com
Be aware that the cheapest may have policies you don't like, like maybe fees to transfer out, high re-registration, ID requirements, no whois privacy, etc.