2010 hybrid brake booster....time to sell?

2010 hybrid fusion(140k miles) had the brake booster replaced 6 months ago. It's currently in the shop trying to get its second replacement. I can't afford $1400 every 6 months. Especially considering how hard finding the part is. Are these boosters that fragile? We've only had this car about 8 months or so. Is there any hope that this booster will last?