Because there are many types on offer, the amount you pay is going to vary enormously. However, a simple structure is in place for the Extra 300 Series. Currently the Rate for Hiring in the UK is £400 per flight hour measured Take-off to Touchdown. The Rate for Hiring in Italy is €400 Euro per FH. 

One-to-One Tuition Fees:

£300 per day plus positioning expenses per Instructor or €400 Euros per day.
£200 per half day plus expenses.

Associate Registered Training Facilities:

Where training is undertaken through approved training schools, payment by the hour is common practice. Rates will vary depending on school but generally expect a minimum of two hours instructor time for each flight, probably around £50 per hour.