A used sump will be fine, but you should be able to get your existing sump repaired.
Generally, there are two options -
1. A helicoil thread repair kit, I'm pretty sure the sump plug is the common M14x1.5 thread.
2. A 'next size up' sump plug kit, you would drill and tap out the existing hole to M16x1.5 and fit a new sump plug.
Both options should be a permanent repair, and it may be possible to do in situ, depending upon access to the sump plug.