PRS 600 still £229 at the UK Sony Store (about $345 at today's exchange rate).
However, I got a $25 gift voucher from Borders when they advertised the PRS-600 for $100 and refused to honour the deal. The 600 is also $169 at borders.com, so I ordered it from there, used the gift voucher and, with postage to the UK, have got one for $153 (about £101)