UPDATE: Thank you all for your comments. I tried all the methods/services. Biggest luck I had with Wordoid. After few thousands of variations I came with 50 .

UPDATE: Thank you all for your comments. I tried all the methods/services. Biggest luck I had with Wordoid. After few thousands of variations I came with 50 .com names. When I tried they real availability it was about 30 free names. I guess that Wordoid just pings domains or have some long cache for whois. However, in sign of appreciation I used affiliate link. So final name is: shopeful.com. I hope that "e" in the middle will be ok.