Look up the Aspire K1. Changeable drip tip, looks good on an ego and vapes like a Nautilus. Under 10$. ET-S is a fine choice too, but if I were to pick, I'd pick the K1.
But. You should get an Aerotank mini because it seems to be the perfect clearo for your needs. The investment is worthwhile, particularly if you want airflow. In a pinch, you can find a mini protank 3 for around 8 dollars, and then slap a 7 dollar airflow control valve on it for similar results - but again, Aerotank mini seems to be more what you want.