Was looking for a new sign up bonus but seems the following is still valid if anyone is interested.
Bamboo is a micro-investments platform that allows anyone to seamlessly purchase digital assets, like Gold and Bitcoin. It's an easy, secure, and effective way to participate in this growing asset class. All you need is a mobile phone and a bank account to get started.
Bamboo sync's your selected bank accounts for transactions. We then round to the nearest full value and easily invest the spare change from your daily expenses into a diverse portfolio of assets.
After signing up, go to 'Home' > enter NUGGET in the 'promo' section and then complete 2 transactions in the app. Minimum fee for each transaction is $1.49. Plus withdrawal fee of $1.49. So that's $4.47 total in fees, netting a bonus of $5.53. — additional information thanks to toobzy
They also have a referral program that offers a $10 bonus!
To confirm can you use both the referral and the promo bonus?