There is a function that returns the cost of the merc based on a simple formula I came up with that is pretty close up to level 65 or so. You should be able to add more based on the proficiency if you wanted to.
You could also do it in sql. I can't test right now, but removing the templates from the merchants would be the best of your options, so you could keep most of the data there in case you wanted it later.
Another option is client version, which is in merc_templates. Set that to a very high number so it won't show up for any client (this restriction works so you don't get unknown dbstring errors for invalid races or classes depending on your client). I'll try to come up with a script when I get a chance.
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