A female monarch lays its eggs (1) on a sprouted milkweed plant. The eggs hatch in four to five days producing tiny yellow, black and white banded larvae (caterpillars). These caterpillars (2) will feed solely on milkweed and eat enormous quantities because they are growing fast.
Roll-up door spring repair or replacement is usually around $200 - $250 for a 2 car door. If the brackets need to be disassembled to remove the springs due to the shaft not sliding sideways enough it will cost you an additional $50 - $100.
The average cost for replacing a garage door can vary per region. I live in the indianapolis region and find that they can cost between $450-$1000. Depending on model, extras etc. I have used access garage doors because they sell wholesale as well as will install garage doors.