Hmm, let's see...
Power Armor costs 8000 thrones (o___o that's dirt cheap), but I would assume the biggest problem would actually be finding one and getting someone to sell it to you. Now, when it comes to vehicles, there are several categories
- Military ones: I assume those behave similar to the PA, the biggest problem finding someone who would sell it to you. On the Black MArket, I'd assume a Leman Russ costing around 25000 Thrones (still dirt cheap, but the imperial throne is kinda... a very, very, very weird currency). Should you be able to procure a vehicle via official channels, the price would be more along the lines of a favor or something.
- Civilian Vehicles: Those are more readily available, with simple cars and trucks probably costing around 2000 Thrones (again, eff that Throne), while you can have all kind of fancy shmancy stuff like anti-grav-vehicles (probably increasing the price by 5x), Mini-Bars etc etc. Of course, you can always build your vehicle yourself, but that'd take some time, spare parts and a bit of reckless abandon
Conclusion: The Economy as described in the books according to Item and service-prices suck, with the throne apparently rapidly loosing in value the more expensive your items get.