Now's not a great time to buy a mechanical hard drive, due to the unfortunate flooding in Thailand. Prices for memory and solid-state drives are still as low as ever, though.
For instance, Corsair's 120GB Force Series GT solid-state drive is available for $204.99 before a $30 mail-in rebate at Amazon right now. This is a 6Gbps SATA drive with peak rated transfer speeds of 555MB/s for reads and 515MB/s for writes, so it's no slouch. The Force Series GT uses SandForce's SF-2200 controller. Just like OCZ, Corsair has released a firwmare fix for the stability issues some users have encountered with that controller.
On the system memory side of things, Newegg is selling an 8GB kit of Kingston DDR3-1333 laptop memory for a scant $42.99. The SO-DIMM kit is listed for $48.99, but you can slice off $6 by entering the promo code "EMCJKHC27" (without the quotes) on the checkout page.
Last, but not least, we see a number of downloadable PC games are still on sale at Amazon—including Battlefield 3, which is selling for $50.99, 9 bucks cheaper than on EA's Origin service. Amazon also has Deus Ex: Human Revolution for $39.99, Dead Island for $29.99, and BioShock 2 for $5.99.