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(In addition, subscribers have access to their PDF back issue library, from the April 2005 issue forward.)
https://www.pubservice.com/Subnew1.aspx?PC=LJ (Instant processing, per next link's page)
http://lj.mybigcommerce.com/products/Linux-Journal-Digital-Subscription.html
(Please allow up to 72 hours for your order to be processed)
$29.50 for 12 digital issues (averages to $2.46/ issue, vs. $5.99 for single, back issues)