The latest in the series at the cheapest price I could find. Don't buy for this price if you're new to the series, i'd recommend picking up #5 instead for cheap as a taster. It's very much a marmite series.
Can also get for the same price at GAME using the £5 off £35 voucher codes if you don't want to use GameGears. (Voucher = PerkUP@GAME353)