BTW, getting the WTCC Volvo's is a great example of how you can save money while buying R3E content if you're smart about it.
If you don't own either the 2016 or 2017 Volvo and want to get both, you'll likely be inclined to buy them both at once, as one transaction. Which will cost you some 400 vRP currently (provided you only buy one livery for each).
However, if you buy just one of those and then, as a separate transaction, you buy the other one, it will cost around 200 vRP overall, yet you end up owning exactly the same content. The reason for that is that if you own either the 2016 or the 2017 car already and want to get the other one, it is only considered a purchase of a livery, not of the whole car, so it just costs 29 vRP.
Obviously, in this case you only save peanuts, but the general idea is always the same.