Of course, you'll have to explain to patients that while it works, MobilECG created it as a toy. The Hungarian startup clearly states that it's "not suitable for diagnostic purposes," so they can't abstain from getting an actual ECG done. The company is gauging people's interest in the card at the moment and is planning to sell it for a rather hefty price of $29 per if it ever decides to release it. If you have the skills to make small electronic devices from scratch, though, you can try to create your own version. The card is open source, and MobilECG posted all its codes and schematics (PDF) online.