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Etap makes most of their boats with "positive floatation" but I doubt there are many in your price range. They way they do it is by having essentially a double hull and filling the space between with foam. It is essentially a very thick cored deck in many way. This makes for a very stiff hull.
Most monohulls—keelboats particularly—do not have positive floatation because the amount of floatation you need to add takes up too much space needed for storage or living area. Most multihulls, having no heavy keel, generally have positive buoyancy.
Adding positive buoyancy to a small monohull is possible, but in many cases not practical. If you're only using the boat for short daysails or weekend trips, then the possibilities of making it positively buoyant are better, since you don't require the same amount of storage and living space as those sailing on longer voyages.
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Sailingdog
Telstar 28
New England
You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Captain Malcolm Reynolds, Serenity (slightly edited)
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