Rear Shocks

That is more expensive than the $89.00 a piece rancho shocks. I see in one other inquiry that a medium to heavy duty hydraulic shock will work good. clamp the springs up front good, and go for street. I am looking for a good shock around 20.-40. a piece. This is just a street cruiser, not a Mopar Missile. Is there an extended length I should be looking for, and if so what application should it be from?