As far as cost, each company has their own way of pricing their services. From what I understand these factors included the overall value of the coin, as well as if you are asking them to verify an error.
I have never personally had a coin professionally graded or slabbed because I don't own a super valuable coin yet. I am sure others on the site can relay personal experiences and recommend a good company.
And just wondering, what coin(s) were you thinking of getting graded?
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