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There are a lot of Facebook trading groups that I've had good finds from. Typically slightly cheaper than ebay but an eager audience!
Put simply – The Lead Mountain is a brand new United Kingdom only Classified Small Ads website which is wargaming dedicated.It aims to put UK gamers who wish to sell stuff in contact with UK gamers who’d possibly like to buy stuff ! Registering as a member allows you to contact sellers, or place your own ads.It is not an e-commerce site or an online auction. Members contact each other through TLM to arrange sales face-to-face, or through the post, rather like Gumtree.
Buying new can be cheaper than used, unless used is really cut deep.