Soma takes up to 79% offsale and clearance items. (Click through the "Sale" tab to see them. Although the banner says up to 70% off, we found deeper discounts within.) Even better, cut an extra 20% offsale items via coupon code "55005". (This code does not stack with clearance items.) Shipping starts at $5.95. A couple of best bets:
Amazon offers Prime members the Bali Women's Passion for Comfort Minimizer Underwire Bra in seven colors (Black pictured) for $11.99 with free shipping. (Non-members can spend $35 to qualify for free shipping; otherwise, it adds $5.48.) That's the lowest total price we could find by $8. It's available in sizes 32C to 42DDD, although not in all size/color combinations.