Proverbs 20:14 -

"Its no good, its no good!" says the buyer; then off he goes and boasts about his purchase.

Proverbs 23:10 & 22:28 -

Do not move an ancient boundary stone

Proverbs 10:9 -

The man of integrity walks securely but he who takes crooked paths will be found out.

Proverbs 11:13 -

A gossip betrays a confidence but a trustworthy man keeps a secret.

Proverbs 14:1 -

A wise woman builds her house, but with her own hands the foolish one tears hers down

Proverbs 24:3-4-

By wisdom a house is built, and through understanding it is established; through knowledge its rooms are filled with rare and beatuiful treasures.

And for those in a slow market 

 Proverbs 15:16 -

Better a little with the fear of the Lord than great wealth with turmoil.