Amazon offers the Samsonite Luggage 12-Piece Compression Bag Kit for $20. Coupon code "25LUGGAGE" cuts it to $15. Plus, Prime members receive free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, it adds $6.48.) That's the lowest total price we could find for this quantity by $35. This set includes two small pouches, four carry-on size pouches, four large pouches, and two extra large vacuum-pack pouches.
Update: Note that this item is temporarily out of stock, but can still be ordered at this price for delivery when available.