You definately dont want to damage the woofer if you buy them on line - you will have NO warranty. But, if you made a deal with you local specialist retailer you will have a 2yr. warranty from JL. Dont believe any hot air the online retailer blows your way regarding warranty - it is NOT through JL. He may say he can offer you warranty - but HE will be responsible for replacement. When/if he skips town you will be S.O.L.
Any reasonable retailer will try and make a compromise regarding internet pricing. It wont be as low, but it shouldnt have to be. There is value in buying from a brick and morter store.
And do the retailer a favor - if you are planning on buying it online DONT WASTE THEIR TIME AT THE SHOP. Send them an email with all of your questions just like the guy on the internet. When you have a problem with the woofer dont bother the retailer - send your internet seller an email. When you have questions about installation - send another email. BUT - if you want to talk to a human face to face that is willing to help you - buy at a specialist retailer.
Rant off
From JL Audios site regarding internet sales.
http://www.jlaudio.com/internetsales.html