Honestly a push CDN zone like Cloudfront or https://www.keycdn.com/pricing https://www.keycdn.com/pricing is what I'd suggest. Its not free but its pretty close

Honestly a push CDN zone like Cloudfront or https://www.keycdn.com/pricing https://www.keycdn.com/pricing is what I'd suggest. Its not free but its pretty close. $1/month unless its super busy.