| a restaurant supply shop would be your best bet.  but there's more to a soda dispenser than just that part.
 if you're getting something with 8 heads like that, you'll need a multiplex rack to store the different soda syrups.  you'll have tubes running from the multiplex rack to the dispenser.  you'll also need a CO2 tank to carbonate the water that mixes with the syrup.
 
 the auction says a novice can install it.  that's pretty misleading.  it's nowhere near as simple as buying the dispenser and dropping it on your counter.
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