you need to sell more stuffs in order for the general store to sell fridges :) Don't have my guide on me or I could tell you exactly WHAT to sell.
I can buy fridges and I still havent even paid the 5k i owe the mayor for my house lol. --- Pearl -3394-9369-3725 Diamond - 4812-3015-2794 Platinum - 3437-8933-2644 AC:CF - Rachel - Ivalice - 4855-5382-2006
Fridges don't come in until the general store upgrades. You need to ring the red bell and find Phoebe first, as well as have shipped at least 40,000g total. Then the small fridges become available, but don't get too excited: they only have 5 slots.