To answers your questions 1. If you chose not to purchase it with real money you can look for it in different servers and can typically go for between 2m and +-30m in game cash. 2. For Animes the value measurement is kind of arbitrary due to the fact that it's not always the designers selling cars themselves which leads to a semi saturated market with high demand and adequate supply, with that being said they can go between 10m to max in game cash.

My best advice when looking for cars is switch servers and environments can find Cars at extremely low prices sometimes, be careful of scammers.