Trade show and fairs always do well for me
They are never 4 figure domain name only sales, but can easily turn a 4 figure domainname and basic website
Industrial estates are always good too, you know these 'workshop' type units, where they are essentially just an oversized brick portacabin ? I don't know what the proper name is for them.
5 page website powered with wordpress or my own cms, and reg fee or caught domain name, =mid-high xxx to low x,xxx in about 12-18 hours including design time and visiting them