I have been considering the following portable finders(no particular order):
Lucky FFW-718 Wireless Portable Sonar Fish Finder:
http://www.amazon.com/Lucky-FFW-718-Wireless-Portable-Finder/dp/B00MARDOCW/ref=pd_sim_sbs_422_2?ie=UTF8&dpID=51HMTiFM5-L&dpSrc=sims&preST=_AC_UL160_SR160%2C160_&refRID=07GWKG126Z4A4YJ61PZ3
Signstek FF-003 Portable Fish Finder FishFinder:
http://www.amazon.com/Signstek-Portable-FishFinder-Outdoor-Fishing/dp/B00C95IUSI/ref=pd_sim_sbs_422_4?ie=UTF8&dpID=41BzyPCtUGL&dpSrc=sims&preST=_AC_UL160_SR160%2C160_&refRID=07GWKG126Z4A4YJ61PZ3
HawkEye FT1PXC Fishtrax Fish Finder with HD Color(also has several models)
http://www.amazon.com/dp/B016O5IDBW?psc=1Vexilar SonarPhone with Transducer Pod
http://www.amazon.com/Vexilar-SonarPhone-with-Transducer-Pod/dp/B00XIUOID4FishHunter
http://www.fishhunter.com/directional3d