Very difficult to know prices as you can get some bags for £10 or less, though they are blatantly crap.
There's only a handful of shops in Bodrum for example where the quality is almost identical to the real thing, and my girlfriend has bought bags from one shop for 3 years consecutively, Miu Miu x 2 and a Tod's bag this year.
She paid £50-70 for each of them, but they are very well made, and will last for years. The shop even offers repairs if any problems. Good range of belts and wallets for us blokes too !
Guzini leather, Bodrum - on the main shopping street leading to Bar Street on left hand side.