For the money you'll spend on crossovers, you'll be better off finding a separate amp for the sub and using the 4 channel to power the mids and tweeters independently.
www.diymobileaudio.com
Edit: That being said, I have a pair of Audiopipe CRX-203 crossovers BNIB you can have...
Kenwood eXcelon XR600-1 Mono [email protected] - $135 shipped
In good working condition. Has been tested and working as it should. Physical condition you can see the pictures provided. Comes with the screw terminal cover & screws. $135 shipped Payment is PayPal " Friends & Family / Gift " payment. PLEASE CONTACT ME BEFORE SENDING ANY PAYMENT PLEASE...
Edit: That being said, I have a pair of Audiopipe CRX-203 crossovers BNIB you can have...

Amazon.com: Audiopipe 2 Way Crossover CRX-203 400 Watts Passive Crossover Car Audio Tweeter : Electronics
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