Wanting to get a knife skin

Like the title says, I'm looking to get a knife skin. But i don't really know what skins I should look for, I don't really have a budget cause I can always keep saving up but I don't want it to be crazy expensive, also I'm using AUD so if its somewhat expensive in the US its probably even more expensive here. can you guys give me maybe a list of some cool looking knife skins that I can have as a saving goals. I do really like the fades, dopplers, and gem skins since I think they look cool, is there any relatively cheap ones?