Got it delivered from AE for 55 USD.
They seem to be accurate but i am yet to check right after fill-up.
I got the outer sensor ones (they replace the valve caps). Inner ones were available for the same price but i opted for outer ones for simplicity.
The unit came with Sensors, A USB drive with Apps, a dongle which connects with the sensors, locknuts & a key.
Installation was fairly simple, i think any standard Android Headunit will work...