Buying and selling : s/b b/o

[Articarius]

Newb question here,

I have seen prices listed with s/b and b/o but cannot figure out what they mean. And the forum search says that "s/b" is too short, so figure I'd just ask.

Thanks.

 

[Bromista]

Starting bid and buyout.

 

[Articarius]

Thank you so much!