What is the cheapest way to acquire bitcoins?
Those fees are madness. Currently, transactions with a fee of 40sat/byte are being cleared. The problem is that fee estimation is not as easy as it looks. Fortunately, I believe Mycellium has the option to input a custom fee.

Buying at localbitcoins.com is one option, or using an exchange like GDAX. Usually, buying larger volumes is more lucrative than buying lower volumes.