Our booking engine at tickets.railforums.co.uk (powered by TrainSplit) helps support the running of the forum with every ticket purchase! Find out more and ask any questions/give us feedback in this thread!
Or the scrapyard - some of them sell bits from stock in for breaking (e.g. Booths) - although the Merseyrail units so far seem to be going to Newport, along with much else, where no parts recovery takes place and stock is scrapped very quickly on arriving.