You can apply via GRO Ireland, they charge 4 or 5 Euros for a research copy.
Yes, but it's genealogy centre practices I was asking about ie if you only want one record and paying the sub isn't economic, as in your case, will the genealogy centre sell a single record.
No I don’t think they will. They used to, but they now have a different charging regime. As has been said earlier, if you want a single statutory record, you are better off getting a photocopy from GRO Roscommon for €4 or, in the case of records in Northern Ireland, from GRONI where you can view them for £2 each. That’s probably cheaper than the genealogy centres old fees anyway.