You haven't really given much information here for what type of wire you are looking for. You say that it's for fabrication,… are you looking for just plain naked wire (not insulated)?
If that's the case my first suggestion would be to go to a farm supply store and buy some electric fence wire. You can buy large reels of it very cheap in different gauges. Sometimes different manufactures make different types of fencing wire too. I'm not sure how well it solders if you need to solder it, but fencing wire usually doesn't oxidize very much. There are different makes so that can vary depending on the manufacturer.
Other kinds of naked wire can be purchased from automotive stores. Sometimes it's called "tie wire" and is very flexible for easy bending, but not springy so it stays in the shape that you bend it. Again, there are different manufactures and probably different types of wire that you can get.
Depending on what you are fabricating, and what gauge you need you might also just try an electrician's store. You can buy naked copper wire which solders easily, but will oxidize. Or aluminum wire which won't solder and will also oxide. Although sometimes you can get either of these with some type of clear coating that will prevent the oxidation.
Another alternative is to get naked wire, build whatever it is you are building, and then spray the finished product with a clear polyurethane to prevent oxidation.
Then there is also the idea of just buying a reel of welding rod for a MIG welder. They have different types of wire too.
All of my suggestions have been for non-insulated wire. I have no clue what you are doing with it so I'll stop here.
I might also mention that you can buy wire braded cables too from many different places if you are looking for something very flexible. A marine outlet would sell flexible cabling that won't oxidize. I have a sailboat that uses thin flexible cables to rig the mast. I think they are stainless steel.
Now you have me curious about what you are fabricating.
