Egg incubators are a specific item that is not sold everywhere. EBay and Amazon are two places to find them though. You could also look for specialty stores that sell them.
From what I have been able to find online, bird incubators are hotter than reptile incubators and the egg turning feature of the bird incubators can kill reptiles.
A farmer can purchase egg incubators online from the Global Industrial website. Alternatively, you can also purchase these incubators from the Incubator Warehouse website.
There are many places to find information about incubators online. You should try flemmingoutdoor.com or globalspec.com.
Nexttag.com will have some egg incubators for you, They seem to be a good company 4.5 Star / 5 stars. There may be a few other websites selling this item too so look around on that market to find the best deal
Incubators can be used to hatch chicken eggs.
There are a number of companies who sell incubators on line. Small incubators for home farms and schools are available from Hovibator, Surehatch, Novital are some names to search for. It depends on what quantity you intend to hatch as they range from 3 egg capacity to 1,000 eggs. Most home hobby hatchers find that 20 to 50 egg sizes are best. Try searching "Home hobby chicken incubators" on a search engine. You can also buy them and get advise from your local feed store or any business that sells poultry supplies.
There are a lot of good resources, but the most user friendly is at Amazon. They currently have a range of incubators within their "livestock equipment" subsection.
Humans frequently do hatch the eggs of ducks and other birds (and reptiles) using incubators.
The developing embryo takes its nourishment from the yolk inside the egg. The embryo doesn't need air until it is ready to break out of its shell.
A fertilized egg that is growing into a chick, after the hen has laid the egg, requires a warm and dry environment for a few weeks to incubate. Man-made incubators are built to incubate over 200 eggs at a time (bigger incubators can hold more), or a nest of straw, grasses and feathers built by a hen are also sufficient, provided the hen is sitting on her eggs as much as she can.
Bed Beth and Beyond's website is one place where egg rings can be purchased online. Amazon's and Target's websites are also places online where egg rings can be purchased.
One can find advice for people suffering from egg allergies online from many different online websites. Some examples include Food Allergy and Mayo Clinic.