What are some alternatives?
When comparing Undeveloped and Domainr, you can also consider the following products
Nuage - Nuage provides domain naming services.
namegrep - Domain name search with regular expressions and curated sets
Domainz.io - Premium domains, for not so premium prices
Agile Domain Search - Search great domain names for your website in seconds.
Short Domain Search - Find short, available single-word domain names
Brandpa - Domain names for startups