Where can I find the value of an antique upright phonograph and radio combination?

<a href="http://search-completed.ebay.com/search/search.dll?sofocus=so&sbrftog=1&catref=C6&from=R10&_trksid=m37&satitle=antique+phonograph+radio&sacat=-1%26catref%3DC6&fts=2&sargn=-1%26saslc%3D2&sadis=200&fpos=ZIP%2FPostal&sabfmts=1&fis=2&ftrt=1&ftrv=1&saprclo=&saprchi=&fsop=1%26fsoo%3D1&fgtp=" target="_blank" rel="nofollow">http://search-completed.ebay.com/search/search.dll</a> You can probably find the value here.  more