It doesn't work that way.

Or else I'm really misunderstanding your question.

You want a poster template that costs more than $20?

Or do you want a template for a poster that, once designed, would go for more than $20?

What kind of poster? For a band? A movie? Lost dog? Garage sale?

You're asking for a pro forma design you can put your art and text into and have it look good. Those don't exist.

Rather, they do — in the form of every other poster you've ever seen.

To answer your question, hire a professional designer.

You can find the mockup for free and there are plenty of websites are available. The professionals are selling and giving such amazing stuff for free. I hope you will get on https://essay-reviewer.com/essaypro-com-review/ happy to use them in your editing work. 

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