collect the review from various sources,
search for it at youtube,
see trophies at ps3trophies.org <- no trophies confirm no buy except super exciting famous game like MGS 4.
see is there any used game yet in garage sales

then there are 2 option,

a)if there are used game,buy a used one
b)if there are none,search the cheapest at shop<-garage sales shop

pay him using online banking.
then waits for 2-3 days.
and tadaa.

but seriously no trophies is a major turn off for me.