Can I get another Flameblade or repair the one I've got?

After some random side-quest, I found the Flameblade. Best weapon I'd seen by far and looks super cool. Not wanting to break it, I've avoided using it in hopes that I would eventually find someone that can repair damaged weapons. My hopes of finding someone like that are rapidly diminishing.

So, is there a way to keep my Flameblade (and other fancy weapons like it) from breaking? If not, can I go back to the place I found it and get another one? If so, when would it respawn?

Doesn't look like you're getting a solid response on how to get these weapons again. This video shows where the Flameblade and the Great Flameblade respawns.

Spoilers, obviously.

To summarise, you go to an area called Eldin Great Skeleton. You will find this northwest of the Death Mountain, and right above Eldin Mountains. A group of tough enemies there have these weapons and they respawn after a blood moon --- so you can get an infinite amount of these, provided you can defeat them.

A great way to repair any tool, including rusted ones, is to throw it at a Rock Octorok when it's sucking in air. It will spit it back out at you fresh and clean. It's official and in the guide, so it's not exploiting or cheating. The Flameblade is a personal favorite weapon of mine too. ^_^