Where to buy a de-commissioned mortar?

Right, I'm a cadet in my last year and traditionally the leaving year gives a present to our SSI, last year they gave him a gigantic bottle of whiskey. I want to beat that, so I'm looking to buy an old mortar (him being an old RA bloke and a sucker for big guns).

I haven't been that successful in finding one on the internet and I figured there'd be people on here who knew more about buy de-commissioned mortars then me. Would it be possible to get some advice about how and where to buy something likes this? Cheers.

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