I subscribe to the local freecycle mailing list and have filters set up in Gmail to label all freecycle mail and have it get archived automatically so it doesn’t clutter up my inbox. I don’t check it every day, so I just want to see what’s available right now. Sometimes I also have a specific thing I’m looking for. To help look for these things, I use the following search string in Gmail.
label:freecycle subject:offer subject:-wanted subject:-want subject:-needed subject:-need subject:-taken
You can also add
subject:bike and it will only return results that have the word bike in the subject line. This assumes that the label you are using for all of the freecycle messages is freecycle.