Digitalocean offers a $10 discount code

Coupon code: SSDTWTTR
The usage is still the same. If you use PAYPAL, you need to top up $5 to get an extra $10, which means you will have a total of $15 after top-up $5. If you use a credit card, fill in the credit card verification and get $10 directly (no money will be deducted)
You can also register with a virtual credit card by clicking on the link: https://www.digitalocean.com/
Detailed usage: http://love8.org/7319.html