Midwest makes an entry level PT boat. Several people have been very pleased with this boat.
http://www.midwestproducts.com/PT109.htm

It might stretch your budget a little.
http://www2.towerhobbies.com/cgi-bin...?&I=LXGYM9&P=7

[link=http://www.dumasproducts.com/cgi-bin/dumas.storefront]Dumas[/link] makes another kit, but it will take some craftsmanship and time to get the boat to the water.
If that is what you are looking for, I am sure there will be people ready to help you out.