1) Go to public session.

2) Withdraw all your money from bank to cash and and deposit back any amount in between $185,000-$1,400,000 to bank.

3) Highlight tank image on the warstock website and press A once, then hover over "BUY IT NOW".

4) Hold start button then when you are ready let go of the start button and press A once quickly.

5) You should see the big map in pause menu now, highlight "Leave GTA Online" press the start button once and you should see the Insufficient Funds alert.

6) Hold the start button, then when you are ready let go of the start button and press A once quickly then press "RB, A, up on D-Pad, A, A" to leave GTA Online. If you don't see 'Leave GTA Online', repeat step 1-5)

7) Xbox Marketplace will load up while you are going back to story mode, press B and back out of it.

8) After story mode finished loading, the warstock website will open automatically and you will see the cargobob priced as $2,200,000, hover over the home button on the website and press A once then go back to the warstock website and you will see the cargobob priced as $185,000. Purchase it and you should now have your cargobob available from Pegasus.