washingtonians, 18 subwoofer box

Just bought a 18" subwoofer and I'm having a hellava time getting this big thing installed in a 1990 honda accord.  (been quoted up to 1900 bucks to build a tl box for me pluueease)

Anyway what would a sealed  (4.5^3) or ported (5^3 @ 30hz) box cost?  Does not have to be fiberglass per se.  I'm curious what I should expect to pay, and if there are any capable people in my area, (seattle, tacoma, bellevue area)  that could help with this project?

Hell I *wish* I could, couple of reasons against doing it :

No garage, and where I live is *not* the best area to do this type of work in, last time I attempted to do this work ( I live basically on a main intersection) on my last system my stereo system was stolen

The lack of tools makes this job pretty much impossible, and finally *time* is difficult to arrange. 

Well, I dont mind paying someone *BUT* it's finding someone who can do it, hell I can help too but like I said trying something like this in my area would *not* be suggested, Dont want my brand new sub, amp, and whatnot stolen.  oh btw its the brutus 1605d amp, (1600 @ 1ohm)

Lol sell, naaw I'm gonna make it fit trust me, I am going to tackle making the box myself ... phunkit, I'm just gonna have to.  No way I'm spending what I've been quoted to pay some putz to do it for me

If it were a reasonable price yea, but now, I'M GONNA do it :D

$1900? Ha ha I would tell them to blow me. If you dont have all the tools for a MDF box, build a fiberglass box, since you want it sealed anyway, take out your trunk, fiberglass requires a lot less tools, you can order the speaker rings, it is more expensive but it will be nice, take out your spare tire and build it in there, you might have to cut a few pieces of wood, but get a shop to sale you what you need precut, if you only need 4 pieces 4x20 or something. good luck man, there is no way someone can sale a box for $1900 unless it was one of the boxes out of the Alpine car or something!

I just wanted to revisit my old post and let everyone one know i was able to find a very nice person to build the box in the trunk.... (yes he was paid)

It was completely sealed off from the trunk, in a 5.2^3 box tuned to 28hz!   Sounded awsome BUT we all know with car audio it's never enough...  I"m going with a different setup, (I just cut the box outta my trunk, damn that was WORK)

I"m working on a *drop in box* this time, (no more 18" for me) for an apx 15" on about 2500 - 3k watts. :)