This is the one I use, and I recommend it:
http://www.ebay.com/itm/CABLE-ELECTRONICS-LABS-AV-400SV-PROGRADE-S-VIDEO-DISTRIBUTION-AMPLIFIER-4-OUTPUT-/371885904314
Edit: just saw the $20 requirement... I bought a cheap $20 splitter on ebay a while back but it had issues with the white balance and other quality issues. Dunno, it might be worth it to just pay the extra $20 and know you are getting something that works.
Well thank you for just making me realize the white balance issues I've always had with GE were due to the power splitter, not my Dazzle, just tested a direct N64 to Dazzle connection, no white balance issues.
I'll probably spend the extra money for a better one.