Tiger Direct offers DNS Management, what you will need to do is login to your domain control panel, go to DNS Management and create a CNAME (URL Redirect) for the url you'd like your domain to redirect to. use the '@' symbol for the host name.
I have never used Tiger Direct for domains, I've gathered this info from their website, they have a screen shot of how to set this up:
If you get lost, post back here. 
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