Hi & welcome to basenotes, & thanks for a great introduction!
l personally love amber & sandalwood notes, & l know a great many others here do as well. There have been a vast number of threads devoted to these notes alone.
l haven't tried any Arabian oils, & l haven't really done any research into them, so l don't know what kind of prices it would be reasonable to expect. They do sound intriguing, but l generally prefer fragrances that l can spray, because they tend to project better. l am also not fond of oudh as a note.
Ambers l would recommend are;
Amber Absolute by Tom Ford
Ambra Aurea by Profumum
Versilia Vintage Ambra Mediterranea by Profumi del Forte.
My favourite sandalwood- by far- is Samsara by Guerlain!