I am not very much sure you need to purchase SSL anymore. There is two way how you can get it free.
1.Either Selecting such a hosting provider who provides it free of cost with hosting. Why not go with one of the world’s best-shared hosting provider and trusted ones.
2.Either go for free via Cloudflare.No restriction on the number of sites you can add. You can find hundreds of youtube videos on that how to setup.
I hope you will find peace of mind chasing for SSL after every expiry.
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