Hi I'm interested in buying your storage unit
Yeah sure, it's in great condition as you see, it looks basically brand new. There's a lot of space. I'm pretty firm on the $25 as this was much more new, anything else you'd like to know?
Is it metal or plastic?
It has metal parts but the drawers are plastic.
Hmmm...since it's used and basically plastic I'd be afraid it would crack or break easily.  Would you be willing to accept $12?
You couldn't find something like this for that cheap. How about $20 and you come pick it up? 
15?
Sure, we can do $15.