Haha, getting started isn't expensive, it's feeding the addiction that can get costly. LOL!
If you start with some crossbred eggs to hatch, a $40 incubator, and the eqpt to make a brooder w/ a heat source, it isn't a high start up cost. You also want a decent temperatur and humidity monitor for the incubator. You can find those at
WalMart for about $6-7.00 and that unit will monitor both things.
Good quality, purebred eggs shipped from someone cost more than local crossbred chickens. Incubators that monitor temp, humidity, and turn the eggs on their own cost more but they can offer a better hatch rate for some people. The less expensive eqpt can be frustrating if you lose a lot of eggs to poor temps and such.
I guess, if you already have some hens and a rooster, your low end startup wold be:
Incubator: $40
Temp & humidity gauge: $7.00
Good flashlight to candle eggs: $12.00
Heatlamp for brooder w/ heat bulb: $15-20.00
Babypool for brooder: $15.00 (can use a large dog crate, old fish tank, lerge rubbermaid type container, or other items in the house)
Water and feed dishes: $20.00 (can use stuff around the house for free)
Chick feed obviously
Total if you had to buy it all is under a hundred dollars to go low end but the experience is priceless!