I sell quite a few things on Clist and Ebay depending on the product. On Clist I don't use the email option because of the spam I was getting, instead just a phone number is provided and I encourge them to text so I can answer just as soon as I have a free hand. I will only save something for about an hour then I start taking other calls/texts on the item. I very rarly get unwanted solicitations anymore since an actual person has to take the time to contact me without the email option.

As far as advertising services, I haven't gone down that road yet...There just seems to be to many others doing the same thing.