Could try a breakers...probably get them for half that price.
I tried this once before..found a breaker who still wanted £350 for em...found him on ebay it was a buy it now or best offer..they didnt sell in the end...after the auction finished we was able to see what offers people put to him...it started off at £200..250..300..last offer was 320 and he refused to sell....its a shame as these are very rare to find second hand...so il think il just bite the bullet and buy new