Amazon offers its Prime members the Crucial 8GB Ballistix Tactical PC3-12800 DDR3-1600 240-pin SDRAM Desktop RAM, model no. BLT8G3D1608DT1TX0, for $39.75 with free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $8.02.) That's the lowest total price we could find by $25. This RAM features 8-8-8-24 timings.
It's currently on backorder but can still be ordered at this price for delivery when available.