Welcome to NamePros! If you're looking to cash out domains quickly, I always advise aiming for .com product/service generics, and CompressionSpring.com is a perfect example of one. "Compression Spring" receives thousands of exact monthly Google searches, boasts a high PPC bid of around $3.00, and many endusers manufacture or research it, including MasterSpring.com, SMIHQ.org, Ist.org.uk, CenturySpring.com, and SmallParts.com. My software appraises CompressionSpring.com at $118 reseller and I'm confident you could flip it for mid-high $XXX an enduser with about 2 hours of well-executed pitchwork.
If you're open to holding on to CompressionSpring.com for the long haul, you might be able to haul in $1K-$1.5K from an inquiring corporate entity.
Good luck!