[tigerCoder]

Hi!

Lately we've been doing some research on prices of electrical components.

We have always got our components (sensors, cables, motors, etc.) from AndyMark, But we found them to be much cheaper in places like eBay and Aliexpress.
For example, a proximity sensor costs 35$ on AM (am-2434) and 3$ on eBay (HC-SR04).

Are there any rules against buying components from such sources?

Thanks!