It's highly unlikely that your dad is going to find one in retail shops because hackable models are older than July 2011.
Originally Posted by Pabben
Your best bet for a new one is small shops who might still have old models on display, or a used one.
You have to look for one with model number CECH-25xx or below. Anything higher (30xx and 40xx) is not hackable. That said, if it's a 25xx, the date code has to be 1B or below, not all 1Bs are hackable. Also, if it's a used one, it has to be on OFW 3.55 or below or already on CFW. If it has been upgraded to OFW higher than 3.55, you will need a hardware flasher to hack it and install CFW.
CECHL 500GB: OFW 2.50 > OFW 2.76 > OFW 3.41 w/ dongle > OFW 3.55 > 3.55 kmeaw > Rebug 4.30.1 > Rebug 4.30.2
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Off to my summer vacation, might be AFK for a while... Happy Summer!