You can get the element from Lowe's / Home Depot / Menards, pretty much any big box home improvement store.
Yes, they are pretty easy to remove and reinstall .... IF you can get the right size socket! That was my problem with my last camper when I needed to replace mine. I checked Camping World and multiple RV dealerships for the socket or a tool to fit and no one had anything. I finally found a socket to fit, had to buy the ratchet to fit it too, and then found out the actual socket was beveled on the inside and the nut that the socket gribbed was so shallow, the socket just slipped. I ended up having to take it to my local dealership to have a new one put in. I spent too much money and time buying sockets that didn't work.