Dropwizard.com $120 per name by paypal only on success
Snapnames.com $69 for 1 snap which can be transferred if not successfull (lasts 1 year)
Namewinner.com $8.97 minimum bid in auction style system. highest bid gets their slot for that name
i've only ever used dropwizard and its owner gmartfin (gordon) provides an excellent service.