I don't know what the rules are about linking to other websites.
It might have the info you want, it may not, but one place that has very cheap ringtones (basically the cost of your WAP) for me in the UK is a place called Free-Ringtones.Eu.Com.
I hope I haven't broken any forum rules, different forums have different rules about quoting other (non-gaming) websites.
Hope that helps, if not, oh well!