It's really just bottling, or kegging. Bottling is a little bit less expensive cost wise, especially if you get bottles from friends, neighbors, family etc. Kegs get up there since there's always more kegs to get, Co2 and then a way to keep it cool.
Lets say 5 gallons gets you 50 12 ounce bottles +/-. It would cost you about 30 in bottles (assuming no free ones) and caps. (maybe 25 or so 750ml champagne bottles?)
Lets say you keg it. 30-40 for the keg, 50 for a single regulator, 100 for a 5 pound tank some additional for hoses and connections. (Though most will have a full combination ket for about 150.) You then need a way to fill it with CO2, which costs depending on your area, lets say about 10 bucks.
Then you decide you need to get or build either a kegerator or keezer to keep the beer cold. With a new one that can be from 200-500, less if you get a free or cheap one off ebay/craigslist. (I'm using the estimate of a homedepot 5cf freezer for 168 and a temperature control device for about 75)
You then will want additional kegs to fill up the space since most will take 2-4 (or more) kegs. (another 80+ bucks). Then you get tired of picnic taps and you build a collar and because you have the collar you want to add faucets. That's another say 200 for 4 faucets (really rough estimate 16 for the faucets or 20 for perlick faucets, 14 for the shank, not to mention the tailpiece and tubing).