It seems like the Sony Ericsson Xperia X10 mini and X10 mini Pro’s prices are out in the UK. An online shopping site called Play.com have listed both the X10 mini and X10 mini Pro with their prices and release dates.
The Xperia X10 mini is priced around £229.9 ( around $351.5 or 15,695 INR) and is supposed to get released by early June this year. The QWERTY version of X10 mini, the X10 mini Pro is priced around £249.9 ( around $382 or 17,060 INR) and is supposed to get released by end of May this year, a bit earlier than the X10 mini. The X10 mini Pro cost a bit more because of the QWERTY keypad.
The Xperia X10 mini and X10 mini pro will be available unlocked in UK. This may not be cent percent accurate but this is likely what these two phones will cost.