GTA V Gunrunning Update - How to get all cars cheap(er)

On the 13th of June a GTA V Online update was released that added in various new military vehicles, bunkers and some more SecuroServ missions.
These new vehicles include:
• BF Dune FAV (An weaponized and armoured variant of the Dune Buggy.)
$1,130,500
$850,000 (Trade price)
• Bravado Half-track (A half track variant of the Duneloader)
$2,254,350
$1,695,000 (Trade price)
• Declasse Weaponized Tampa (A weaponized and armoured variant of the Tampa.)
$2,108,050
$1,585,000 (Trade price)
• HVY APC (A heavily armoured aquatic tank.)
$3,092,250
$2,325,000 (Trade price)
• Pegassi Oppressor (A new motorbike with a rocket boost and the ability to glide.)
$3,524,500
$2,650,000 (trade price)
• Vom Feuer Anti-Aircraft Trailer (A new anti-aircraft trailer.)
$1,400,000
• Mobile Operations Center (A new trailer.)
$1,225,000
• Jobuilt Hauler Custom (A customised variant of the Hauler.) (Free with the trailer)
• Jobuilt Phantom Custom (A customised variant of the Phantom.)
Costs an extra $

All of these vehicles are expensive, but there is a way to lower the price on some of them by doing missions that you can access in your Mobile Operations Center (The new trailer).
These missions are
• Severe Weather Patterns (Dune FAV)
• Half-track Bully (Half-track)
• Exit Strategy (Anti-aircraft Trailer)
• Offshore Assets (APC)
• Mole Hunt (Weaponized Tampa)
• Work Dispute (Oppressor)

Overall I think this update was great as it added some fun new vehicles and missions, I would rate it 9/10

(To access these missions you must first buy a Bunker and Mobile Operations Center this will cost a minimum of $2,390,000)

(Upvotes, Follows and ReSteems are greatly appreciated )