There are a ton of site which offer ringtones over the internet for a few busks and some for free. If you are looking for some professional ringtones then toneShared.com may interest you.
toneShared offers collection of ringtones made by musicians and artists. You can browse through the collection of ringtones available from the site and download them instantly in MP3 format. You can play the ringtones before downloading them by clicking on the name.
Collection is arranged by artist name, most downloaded tones and new tones. Click on artists name to see all the ringtones made by that person. The artists page includes a photo, brief information and a link to the personal blog or profile page so you can quickly know about the background of the artist.
If you are looking for some quality ringtones for free check the site, you can also create your own ringtones using free services.