Bottling soda is problematic. Either you use yeast for carbonation and that means bottles must be kept cold or you force carbonate in kegs and bottle. It would be very difficult to do the latter and maintain typical carbonation levels. Things like the Beer Gun work fine at 10-12 psi, but soda needs to be 3-4 times that.
You could sell on draft yourself, but most businesses have gone over to soda concentrates that are mixed while being dispensed. This requires very specific packaging of the concentrates.
It's possible that some low volume beer bottling systems will work with soda and you might be able to find a used system in your price range.
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