Outee via Amazon offers Prime members its Outee 7-Piece Dungeons & Dragons/RPG Dice 6-Pack (42 dice total) for $9.59 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $6.12.) That's the lowest total price we could find by $2. Each of the six sets includes a d20 die, d12 die, d8 die, d6 die, d4 die, two d10 dice, and a drawstring pouch.
Of note, eBoot Online via Amazon offers a similar set for $8.99 with free shipping for Prime members.