Some helpful information when buying a ps3 (and how to identify one without knowing the serial model number) : r/PS3
How to Jailbreak a PS3 (with Pictures) - wikiHow
What Can A Jailbroken PS3 Do? – Retro Game Buyer
All ps3 models are now jailbreakable details: for cech model 20xxx, 21xxx and 25xxx cfw jailbreak for cech3xxx and cech 4xxx hen fw jailbreak price: 1k free 2 games additional games cost
PlayStation 3 models - Wikipedia
Hackable PS3 models and information | GBAtemp.net - The Independent Video Game Community
Chapter II - Hardware Needed for PS3 Downgrade | PSX-Place
Ever buy an original PS3? Sony may owe you $65 - CNET
Step-by-Step Guide to Jailbreak Your PS3 - il4Syrians