You'll very likely save a lot more buying an already finished weapon, at least a +17 16* one. In general, perfecting an arcane weapon from scratch takes ~20k depending on RnG, whereas for fully dslotted items that number can be in the low 10's for unpopular/weaker/exclusive classes (e.g. Crossbow, Katana, Gun) to 15k+ for the more popular/stronger ones (e.g. Dagger, Claw, Axe, Ancient Bow). Rule of thumb is that made items are almost always cheaper unless you're buying ridiculously perfect end-game ones.
Flaming makes the pricing trickier because there are just so many possible rolls. Don't concern yourself with Flames until you're 70k+ stat.