http://www.slmtoyota.co.uk/plus/aygotyres £399 for a new set
http://www.ebay.co.uk/itm/Toyota-Winter-Wheels-175-65-R14-/171127210030?pt=UK_Cars_Tyres_RL&hash=item27d7fa002e
used on ebay £200 - tiny bit bit bigger (10 mm wider) but shouldn't be a problem.
The wheel fitment is the same, but according to wheelfitment.eu the thread size is different so you would have to use your old/existing wheelnuts/studs.