why not just go to the LFS and see if you could have, or buy a peice of filter media from an already established tank, most come in 2 stage filtration so taknig out one wont hurt his/her fish but will instantly set up your tank. Then once your filter is in place with the established media, add your fish, (slowly though, maybe over a week or 2 bring it up to you stock) this allows time for the nitrifing bacteria to transfer and grow to be able to support a full tank!
there you have it, no 2-7 week wait for a fish, no ammonia, no loss on a fish cycle. this is what i did for all of my tanks, except i used friends , and my own tanks to cycle my others!
hope this helps!!