I like buying second-hand things for the same reason. Op shops, markets and garage sales – I love them all. I love browsing through people's discarded things because you never know what you're going to find, or what's going to find you.
I found these coffee and sugar containers at two different op shops, several years apart. Although my style is by no means neat and tidy with everything catalogued and in its correct place, I just couldn't resist buying these oil and vinegar bottles at a trash and treasure market recently, because they match the jars exactly.