Amazon.com is selling The National’s High Violet for $4.99 between 9 a.m. and 1 p.m. on Saturday, Nov., 27.But, yes, there is a catch. You’ve gotta plan your shopping a bit in advance. Amazon’s been selling a ton of records at a discount all weekend, but only for a few hours. The good news is that the price for physical albums is bargain-basement, around the $4.99 and $5.99 mark. You can see the whole list here, and here are a few highlights to put on your radar:Today, from 1 to 5 p.m.: N.E.R.D.’s Nothing; Lil Wayne’s I Am Not a Human Being both for $5.99Saturday, from 5 to 9 a.m.: Vampire Weekend’s Contra for $4.99, Gorillaz’ Plastic Beach for $5.99; from 9 a.m. to 1 p.m.: Sufjan Stevens’ The Age of Adz for $5.99, The National’s High Violet for $4.99; from 1 to 5 p.m: the xx’s self-titled 2009 debut for $5.99; from 5 to 9 p.m.: Deerhunter’s Halcyon Digest and LCD Soundsystem’s This Is Happening for $5.99