New coupons at Alibris

Used bookseller Alibris has these coupons and offers today [Exp 4/30]:

$2 off $20+ w/ code PICOULT

$4 off $40+ w/ code STOCKETT

$6 off $60+ w/ code SIMONSON

$8 off $80+ w/ code POLLAN

$10 off $100+ w/ code STACKHOUSE

$15 off $150+ w/ code WOLFHALL