Century has a $75 minimum order (between the HotShot and PMP it shouldn't be hard) and requires a waiver and ID, thusly:
"However, you must read and sign the this release and liability waiver and mail or fax it to us with a copy of your I.D. This waiver is required to be on file with us regardless of any non-firearm item you purchase from us and only has to be submitted once. ie: If you are ordering scopes, we still require that you send in the waiver of liability so that your account can be setup in our computer system."
When I click on the waiver, I get an error.
I would send in an order with the standard "I am over 21 and am not forbidden...etc." disclaimer, and copy of ID.