When it comes to these vital parts, you'll want to go new. You can go just about anywhere for them, but the most accessible place to check is online. You may not be able to tell what exactly you're getting until it shows up, but you can find just about anything. On top of that, most sites will deliver the part straight to your house, or at least to your local mechanic.
Another, idea that struck me. Heated seats. This is actually a fairly simple idea. You can pull them from any factory-equipped car. Try the local movie where kid find a robot suit in the junkyard. Just make sure they can bench test them before you walk out the door. You'll want the thermostat control with this, which can be mounted under the tail for adjustment while riding. Basically, heated seats are no more then a heating pad element that sits under the upholstery, a top the padding. The heating elements average about 100-140 degrees F. I did a search for "Upholstery Heating Elements" and came up with some good results and even installation instructions and tutorials for various seats. Both OEM and retro fits.
Before used auto parts salvage had been primarily occupied by the big conglomerates such as NAPA, Checker and a few others but thanks to the internet this is changing. Today anyone who has an access to the internet has the opportunity to unlimited potential, and better yet create it from the comfort of their home. According to eBay motors 4.5 billion dollars worth of automotive related items are sold annually making it the most profitable sectors on eBay. The majority of sellers are ordinary people who buy and sell for a profit.
Yes, good old junk yards where most sales are cash and no refunds are available. The parking lot is loose gravel and the counter at the office is greasy and dirty. The prices are not set on a computer but the attendant sets the price when he is selling the part. A junkyard owner or manager sometimes will allow the buyers to remove the parts themselves making the price even lower. And of course, there is always the opportunity to negotiate a lower price for a part does not have a label and that is not registered in a computerized inventory.
People, usually, have an opinion that these second hand parts are of very poor quality. They think that the only place where they could hunt for them is a nearby junkyard. This is, however, not the truth. In fact, there are many reliable and reputed places where you could find used auto parts that are as good as new ones. What's more, you get them at incredibly low prices. This, however, doesn't mean that they're of inferior quality.
There are different places one can look for auto parts such as local specialty stores, online stores or auto parts auctions, and last but not least junk or salvage yards. Every place has its pros and cons.
These days it is so much easier to work from home online. It is becoming more and more common for people to work from home than from away from home at an office. This has become more possible because of the increasing technology.
Monster Jam has several themed vehicles dedicated to comic/cartoon characters. Iron Man, Superman, and Batman all have their own monster truck. The latter is more of the 1960's Batman due to the high tail fins bracketing the truck's bed. There's also a monster truck dedicated to Taz (Tasmanian Devil), the famous Looney Tunes character.