Same here, I've owned 5 dwarf gouramis and 3 have died a few weeks or a month or so after buying them, the ones I have right now act very healthy, but they always die quite suddenly so I don't know if they will pull through. Dom90 I meant was he friendly to you? My first DG acted like a dog... VERY friendly.Only a few weeks? Is it possible he had dwarf gourami iridovirus? I read somewhere online as much as 22% of all dwarf gouramis in the industry have it. Don't quote me on that though. I have had pretty bad luck getting healthy dwarf gouramis myself.
The stock from this store is usually good. I went there on the good reviews I had read on yelp.From my experience, yes, it's likely iridovirus.
When purchasing a dwarf gourami in particular, make sure none of the other DGs look stressed, sick or dying. You want to get the fish from as healthy of a source as humanly possible.