The 500 V-Bucks plus Starter Skins is only 15 Zloty (3.50 Euro) while it costs 4.99 Euro in Euroland. 1000 V-Bucks costs 39 Zloty (9.10 Euro) while they cost 9.99 Euro in Euroland. That's a saving of about 9%.
The cost of 13000 V-Bucks varies according to platform and region. 13000 V-Bucks can cost between $79.99 and $99.99, depending on the platform and region. Here are the prices for other popular currencies:
These will pay you out in V-Bucks depending on the number of quests you complete. In order to get all of your cash from this is to complete 30 quests, according to FireMonkey.