If there is one before the end of the year, it would be the Oxford vaccine. I believe the US secured 300M doses back in May, but I don't know if it will be ready that soon unless they bypass FDA approval.

https://www.reuters.com/article/health-corona...SL1N2D30RM

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The US Department of Health agreed to pay the $1.2 billion to accelerate development and secure supplies, Reuters reports. “This contract with AstraZeneca is a major milestone in Operation Warp Speed’s work toward a safe, effective, widely available vaccine by 2021,” US Health Secretary Alex Azar said.

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