You need to be on O2 Business and pay £150 but I reckon you could get one on ebay (they rarely go up) and then call O2 to add your number to it. You might need to say you have a business contract but want to add a non-business number or say you used to be on business and still have the box. If you need the direct Boostbox number let me know as they are helpful, not sure if you can order directly from them though.
http://www.ebay.co.uk/itm/O2-Boostbo...item23421c17d5
On consumer mobile you could find a postcode in your area with poor signal, complain that you now work there and it's unusable, see if they mention a boostbox but you will need to pay for it. I was on business and had to buy mine even though I kept complaining about the signal.
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