Check you local Home Depot, they had a bunch of kegerators on clearance at my local HD last week. Under $300 and for about another $50 you can have it setup for two cornies.
Beer Keg Dispenser - MCKC490S at The Home Depot
I have seen this for sale for as little as $350 in store. It is only a 4.9CF. the 2 i listed earlier are in the 2.5CF range.
It would take a bit more than $50 to set it up for 2 cornies, as there is only a single draft tower. gas and liquid DCs should only be about $15 for the pair, plus some hose clamps. If you don't mind only having 1 served at a time, I bet a 2nd keg could be chilling in there waiting for the first to go empty.
Since this one is not made for 2 cornies, I would goto homedepot with a template to make sure they will fit (Always take a keg template when checking out a fridge that will hold cornies.
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