Web site like Kijiji & Craigslist are called Free Classified ads site. There are 100's of these types of web site off-course not as large as Craigslist.
The website Kijiji is a free, local classified ad and posts website. Kijiji is a subsidiary of eBay that was launched in March 2005. The website offers the same services as Craigslist.
You can find cellos for sale on the Kijiji website under the "musical instruments" category. To get to this section, visit the Kijiji website and click "musical instruments" under the "buy and sell" section.
Go on your local classified website like craigslist or kijiji and check under "gigs" there should be dozens.
I would guess that you would have to buy it off of a website like kijiji or Ebay
How much it costs to advertise on the Kijiji website depends on how long the advertisement will run for and where it will be placed. The shorter and less conspicuous the less costly it is.
Kijiji is a very popular website for advertisements. People could visit this site and see the classified advertisements which are on many different topics. They could also post their own advertisements for free.
Ebay, Creigslist, or Google Shopping
You could try Kijiji or ebay. Or sellyourbike
One can find a website listing hot jobs on sites like Kijiji or Craigslist where one will find all available jobs and one can also apply to them by emailing their resume.
I would suggest amplezone.com for a website similar to craigslist.org Amplezone is simple, easy to use, and it's free for classified ads. www.AmpleZone.com
I would suggest looking in the local listings in the newspaper if you are from Washington. If not you could use a website like Kijiji to check what is available in Washington.
YOu can check their official website to see how much they are going for. If they are expensive try a site like kijiji or ebay, they may be cheaper than the site.