I have spent and embarassing amount of money on the IFHF site but have found ways to extract information without paying. For example, you can search the main database with surname, county and father's name. That gives you a list of christian names and years, which can then be searched by parish on the County advanced database to get parish. Then, you can add in mothers' names. That then narrows it right down before buying a record.
Remember also that a lot of parish registers are on LDS microfilm and can be ordered for just $9 through their excellent service and viewed anywhere around the world.
John