You can make a small cooler incubator for less than $150 knowing that the most expensive of equipment is a reliable thermostat.

Most people chose artificial incubation because it is easier to provide the proper environment (temps and humidity) in a small container than it is sometime in an enclosure, it also allow you to get your females back on food faster (often female incubating their eggs will not eat).

Ultimately they is more than one way to do it, you need to find the one that works for you.