Alexa rank, $/€ per month, domain name service :

189 - 12 - godaddy.com
1296 - 1* - 1and1.fr
1815 - 10 - namecheap.com
3377 - 10 - name.com
5567 - 12 - dreamhost.com
11222 - 13 - gandi.net
13421 - 9 - namesilo.com
19083 - 13 - hover.com
27350 - 12 - iwantmyname.com

*first year.