Try West Marine, Achilles, etc.
Ocean sailing requires some different gear. There are a lot of dingy's out there. If price is no object, West Marine and Achilles have very good inflatables. You will find that there are a variety of styles, lengths, hard bottoms, etc. If you have a small engine, then a 9-10' dinghy should be OK. Hard bottoms will plane if you have a 25hp motor or so. If price is important, look at the used ones. Make sure they hold air for a while and have a HIN on the stern and are not stolen. Ask for paperwork It's really nice to find an anchorage or mooring and motor to shore and back, especially if there is wind. The low stern step on the X makes for easy dingy boarding. When sailing you can just tow it. Makes an emergency life raft too, although the Macs rarely sink.Another piece of gear I wouldn't go out in the ocean without, is a good radar reflector. Many of these are cheap and work pretty well. SAIL mag. rated them recently and found some that give a 30 meter square reflection from almost all directions. This means that your little sailboat would look like a much bigger boat to an ocean liner, or a rescue crew. Also, a 25 watt VHF is a necessity, as is GPS and a cell phone.