Is there a cool place online where I can get a used zodiac or inflatable boat for cheap?
e-bay
e-bay

Ribbed construction adds strength. Fenders also have inflation valves to set your preferred level of firmness. Per each. Colors: White, Navy Blue, Black. Sizes: 41/2″ x 16″ 51/2″ x 20″ 61/2″ x 23″ 81/2″ x 27

THIS ITEM SHIPS VIA STANDARD GROUND SERVICE ONLY!! The Sea Eagle PadleSki Catamaran/Kayak is Five Boats in One! If you're looking to have fun on the water in all kinds of ways, the Sea Eagle PaddleSki is for you. The unique catamaran kayak design allows for unprecedented over-the-water performance in all kinds of configurations. With ordinary kayaks you have to choose between a stable, wide craft and a speedy, tippy narrow craft. That's not so with the PaddleSki. The catamaran/kayak features two widely spaced inflatable tubes that cut right through the water but give you a solid, well balanced boat. Standard Features: * NMMA Certified * Two skegs for directional stability * 6 D-Rings to secure seats for one or two person use * Three aluminum crossbars for a rigid structure * Four side carry handles & bow handle * Front Spray Skirt with water deflector guard & rope lacing * Wide beam hull design for stability Contains (1) 395ps Paddleski boat, (2) 8FT AB30s, (2) Kayak Seats, and Foot Pump Ships in 2 boxes total. Hull Box38×19x13 Paddle Box51×10x5 Specifications: Exterior: 12' 11 x 3' 3 Interior: 11' 6 x 1' 4 Deflated: 38 x 18 x 9 Tube Diameter: 12 1/2 Capacity: 2 Adults or 500 lbs. Weight: 49 lbs. Chambers: 2 (port & starboard) Material: 1000 Denier Reinforced Seam: Quadruple Overlap Seam Floor: 2000 Denier Reinforced Material Air Valves: Halkey Roberts One Way Engine Capacity: 85 lb. thrust electric or 3 hp gas Inflation time: 5 min. Weight: 70.00 lb(s) Manufacturer: Sea Eagle THIS ITEM SHIPS VIA STANDARD GROUND SERVICE ONLY!!
The tour boats are a cheap way of getting around the harbour but they have to stick to a set route. They offer fixed prices per person with reduced rates for children. These trips generally take about an hour and cover the main areas of the harbour.
Another option is to charter a RIB (RIB Charter) – (rigid inflatable boat) for the day. If you take some friends or family this actually works out great value for money and gives you the freedom to chose which parts of the harbour you visit. The Rib can be at your disposal all day and some are capable of over 50mph so you can be anywhere in the Solent in no time. Portsmouth harbour actually has a speed limit of 10 knots so if you hire a Rib and fancy doing some wave jumping and high speed turns you have to venture out of the harbour.
You can also tour the harbour in style on a Thames sailing barge. Thames sailing barges were initially used for carrying cargo up and down the Thames and from 60 to 100ft. Due to there shape, they have huge deck space and large areas beneath deck. As with the Rib you can chose where you visit and you are not restricted to Portsmouth harbour alone. Despite there large size the lack of a keel means that you are not restricted by shallow water which is handy as Portsmouth harbour is very tidal. Most of the sailing barges also have plenty of berths down below so you can even sleep on the boat and continue sailing the next morning.
What ever method you chose to explore the harbour you can almost guarantee a great day out with plenty to see and do. Rib and Thames barge charters give you more freedom and add another angle to the day’s fun but the tour boats offer a very cost effective method of exploring Portsmouth harbour.
Keith McGregor
http://www.articlesbase.com/travel-articles/a-day-out-in-portsmouth-harbour-the-best-way-to-explore-410875.html