a couple points
Depending on what year, make and model your car is, curb impact [only] should never deploy airbags. If it's a Late Model Car, take it to the dealer for inspection.
Was the Driver or Passenger injured ?
If you bought it used, opens other discussions.
Replacing airbags alone is not advisable, you also have to replace airbag module/s. If not, when needed they will not deploy.
I would let my insurance company look at the vehicle, if it's an older car and the estimate totals out the car, buy it back for salvage, repair it at a dealer and keep it.
Buying Used Airbags, Very Inadvisable and can be Illegal in some jurisdictions.
It's Not How hard You Hit, It's How Fast You Stop=rate of deceleration deploys airbags.