TubeNet

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Here's an idea I have:
when you sell something, you'd see a list of options and you'd "check off" one (in the format of a poll):
BBb
CC
Eb
F
Other tuba
Marching Brass
Euphonium
Trombone
Accessories
Wanted
Other
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The items would all be in the For Sale section, but (according to this idea) someone who is searching would be able to check off one or more options to narrow down results (again like a poll).

I don't know if it could be done, but I think this could make searches easier.