I'm sorry for your loss; it's rough losing a pet, especially after caring for it for so long.
However, take this opportunity to learn a bit about fishkeeping:
The number one thing you'll learn about this hobby is that the price of the fish has very little to do with the cost of caring for it. Goldfish, especially feeders, are mass produced and thus can be sold for very little money. The common feeder goldfish is the same fish as the comet goldfish, a species that will grow up to 18" in length. They also produce a massive amount of waste so strong filtration is needed. In the case of Quincy, he was likely quite stunted due to the cramped conditions of living in a small bowl. I can't imagine how quickly nitrate builds up in a bowl that size, so it's also very likely that he had been suffering nitrate poisoning his whole life. Comet goldfish should be in a 10g tank for starters, but will eventually need a much larger tank (I would say at least 75g, as that's the smallest tank volume-wise that's as wide as the fish is long). In cramped quarters, a fish will get stunted and suffer all sorts of health problems which likely compromised your fish's immune system.
The feeders you buy at pet stores are often kept in extremely cramped, disease-ridden tanks, so it's likely the fish you got were diseased when you bought them. Also, adding that many goldfish to a small bowl in such a short amount of time likely made your ammonia shoot through the roof, which resulted in the death of your fish either directly or by reducing their immune systems capability to deal with disease.
So, here are my suggestions for the future:
If you're hooked on goldfish, realize that for them to be healthy and happy, they do need very large tanks. A single fancy goldfish would need at least a 29g tank, preferably a 55g, in order to thrive. A comet goldfish, as I mentioned, needs at least a 75g tank. Goldfish need massive amounts of filtration and frequent water changes to deal with the amount of waste they produce. If you cannot afford these accommodations or don't have the room, you should consider some fish that stay much smaller.
There are many species of tropical fish that will fit well into a 10g or smaller tank, with the smallest recommended tank size for just about any fish being about 2.5 gallons. A complete setup for any tank in the 2.5 to 10 gallon range will run you about $50 total, including the tank, canopy, lighting, decorations, filtration and a heater. However, beyond this initial expense there's not much in the way of maintenance costs, other than food. I suggest looking at lists of tropical fish on the internet or looking at the fish in person at a LFS (local fish store) and making a list of ones you like. Then, you can ask here about stocking plans.
Before you purchase any fish and before you even purchase a tank, I strongly recommend that you research the "aquarium cycle," which is essentially just the part of the nitrogen cycle that happens in your fishtank and has a huge impact on the health of your fish, as you witnessed when overstocking a small fish bowl.
Here's a link to an article about the aquarium cycle: http://www.fishforum.com/viewtopic.php?t=343
Hope that helped!