Maybe a Vulfix 404 for less than a tenner, mixed boar and badger:
http://www.amazon.co.uk/Progress-Vulfix-Grosvenor-Bristle-Shaving/dp/B004X1BFEM/ref=sr_1_25?s=drugstore&ie=UTF8&qid=1326742250&sr=1-25
Is there a reason why it has to be boar other than cost? I know you said you have a nice and expensive badger, but badger can also come in cheap and scratchy* flavour and I think it performs way better than boar even at the budget end. Edwin Jagger black badgers start on Amazon for £15:80, see link below.
(* Only kidding on the scratchy, I have one and it's ace, certainly worth that extra fiver).
http://www.amazon.co.uk/Edwin-Jagger-Plastic-Handled-Shaving/dp/B003LW6S0U/ref=sr_1_38?s=drugstore&ie=UTF8&qid=1326742387&sr=1-38