May I add a request for "wanted ad" with a [Brit] flag?
This is more commonly used in the UK - "want ad" sounds AE to me, while "wanted ad" trips off the tongue.
I can't come up with a dictionary source at the moment, but "wanted ads" is the term that "Exchange and Mart" (one of the best known UK resources in "For sale and wanted") uses in its link:
"View our wanted ads in The Mart. If you happen to be ready to sell any particular item you have, make sure you check the wanted ads out as someone may ..."
the first of the 117,000 Google hits for "Wanted ads" site:.ukhttp://www.google.com/search?hl=de&rls=com.mi...
"Search Wanted Ads"
"Submit a New Wanted Ad"http://www.recycle.co.uk/wanted.categories.php
"Wanted ads are a new and increasingly popular feature. As an advertiser you can list adverts for items you want and sellers can submit offers for items they are selling. I's a quick, simple and hassle free way of sellers being able to meet buyers demands."http://www.studentbooks.co.uk/help.php
"The following is a list of the most common abbreviations found within For Sale / Wanted Ads, Discography's and Label Listings."http://www.dragondiscs.co.uk/abbreviations.html
"MercSearch - http://www.mercsearch.co.uk
A range of new and used Mercedes Benz vehicles for sale including Smart Car. Supplier directory and wanted ads section."http://www.google.com/Top/Regional/Europe/Uni...
It can be preceded by "Help", "Job", "Flat", "For Sale and" etc., but "wanted ad" can stand alone and this type of classified ad may cover anything from cars to tropical fish. IMHO there is no need for scare quotes around "wanted" as in the original suggestion.