Your options are:
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Buy 1 and modify it as you need it, but you need tools and space in your house to work on this. Also time with no surrounding distractions.
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Ask how much it cost if you could just pay for the profit of 50 units plus the cost of making one (or two) units - you could be looking to pay around 5x the unit price by this method but at least you wont be buying 50 of them.
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Find 49 trusted other people who need the same specifications as you do and not be scammed when it comes to delivery/shipping.
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Befriend and refer a local business to the supplier so that they will like you and have your unit at cost. Make sure they understand that you are doing this for them for the custom unit.