For someone keen on using paperspace you can actually get max 30$ credit from paperspace
First create the account via Fast AI Promo link
https://www.paperspace.com/&R=FASTAI15
Once account is created go to Billing, Don’t add your credit card as of now just go to billing
add this as promo code DDQRI0U you would get 10$
Now on the Machine tab create your machine as instructed in the video
Below the credit card tab there is another promo tab
add this as promo code HNGPU5 you would get another 5$
once you do this then add your credit card details. You would have 30$ to play with your machine remember as soon as the machine is created you are charged 5$ for storage and 3$ for public IP