You can make an incubator with virtually no money. I made my first one with a styrofoam ice chest. I made the one I use the most with a broken dorm fridge I got free on freecycle (it's like craigslist, but everything is free), a thermostat and heating element from a styrofoam incubator that my sister in law got at an auction for $5 because the viewing opening was broken and the styrofoam was cracked, and a $3-$4 little personal fan to move the heated air around.
And you can get fertile hatching eggs for anywhere from $2-$3 to $75 or more per dozen. Preferably buy them from someone locally, so the eggs don't have to be shipped hundreds of miles (that's really hard on hatching eggs, and really lowers their viability), and buy eggs for a breed that does love to go broody, like Silkies or Banty Cochins. Then, there are dozens and dozens of how-to instructions for how to hatch eggs all over the internet. And have fun with it - and DON'T expect a good hatch your first few tries!