I've went to MAZDA, and they said I have 2 bad rear motor mounts, and they said it's going to cost 187$ Right and 166$ Left.
Are they both different? are the front Mounts Different from the Rear Mounts, if so can anyone link me to the cheapest rear mounts?

 

Engine mounts? There are only 2 on the car. They're not very hard to change. 6 bolts total and support the engine with a 2x4 jacked up under the oil pan.

Check Mazmart for some OEM replacements. I've also installed a few sets of Rx8performance motor mounts in a few 8s and they are very good quality aftermarket mounts as well.

 

The left and right are different, and they are known to fail over time. Whether you want to replace them depends on the symptoms you are having. BHR is another good option for motor mounts.