Our store has a very good domain search and domain suggestion tool
You can check availability of domain names here :
https://ciscowebservers.com/purchase-domain-names/available-domains/?sld=desireddomainname
Just you need to change sld query string with your desired domain name to search
For example for bitcoin related domain name search you can use this query:
https://ciscowebservers.com/purchase-domain-names/available-domains/?sld=bitcoin
For cryptocurrency you can use this address:
https://ciscowebservers.com/purchase-domain-names/available-domains/?sld=cryptocurrency
or
https://ciscowebservers.com/purchase-domain-names/available-domains/?sld=crypto
or
https://ciscowebservers.com/purchase-domain-names/available-domains/?sld=crypto-currency