Since he is rather tall, buying a stock set of irons off the shelf may not work for him. You also didn't indicate if he is a beginning golfer or someone more accomplished. When first starting out, clubs don't matter as much as developing a swing (i.e.. grip, alignment, swing plane, etc.) which takes practice and best done with a golf pro. More accomplished golfers will benefit from having clubs fitted to match their ability (i.e. shaft flex, loft/lie, etc.). Used clubs would probably only be suitable for a novice golfer.
Even for fitted clubs, you will find quite a range of prices. There are various online golf websites where you can see what would be in your price range.