Today only, Groupon offers a 2-Month Netbricks Advanced Designer Subscription for $19. Coupon code "TRIPLE" cuts it to $15.20. That's $4 under last week's mention, $55 off list, and tied as the lowest price we've seen for this LEGO rental service. This level includes up to $200 worth of new, retired, and classic LEGO sets.
Also available is a 2-Month Netbricks Master Builder Subscription for $29 before the above coupon, $23.20 after. It includes rental of up to $400 worth in LEGO sets.