If you have list of spare parts I can recommend to search good prices online. I can recommend Concord Spare Parts online store, here is a link for you, there are DODGE CHALLENGER 2015 Engine Miscellaneous (Switch, Cap, Mounts) there.
Yes, usually I use it. Price depends on in what country you want to order this service. I recommend you to order everything in advance and plan your trip very thoroughly. I can recommend to order transfer from the airport here https://gettransfer.com/en/directions there are many directions.