just find a junkyard near you and see if you can find a trunk in good condition with no spoiler in your color. my car had no spoiler when i bought it and i wanted one so i found a black trunk with spoiler and swapped it instead of drilling holes to mount one, i wasnt sure if i would like it.
now if i ever want to go back i have my stock trunk, oh and i paid 100 for a factory painted good condition trunk with spoiler so im sure just a trunk would be about $75