There are lots of Victory kits on the market - and several more that have been discontinued, but can still be located.
Probably the best one, in terms of historical accuracy, is the plastic kit from the French company Heller, on 1/100 scale. That makes it about three feet long. It's readily obtainable from decent hobby shops - but quite expensive (usually in the neighborhood of $100). It suffers from some relatively minor mistakes and omissions, but is one of the best plastic ship kits ever released.
Two smaller-scale kits are made by Airfix and Revell. The Airfix one is currently in production; it's somewhat larger than the Revell one. (I don't know the exact scales, but they measure about twenty and eighteen inches in length, respectively.) The Airfix kit is basically sound in terms of accuracy with one major exception: the shape of the bow is seriously distorted. The Revell kit is no longer widely available in the U.S., but is in the current catalog of Revell Germany. So it should be obtainable through good hobby shops. It's actually, to my eye, a little better detailed than the Airfix one - and the bow is shaped right.
Airfix also makes a tiny, waterline version of the Victory. It's about five inches long, and has been on the market for about forty years. I don't recommend taking it seriously, except perhaps for wargaming or a gift for a kid.
If you are interested in a small-scale Victory, the range of white metal kits from the British firm Skytrex is worth a look. I have their 1/700 Victory (though I haven't built it yet), and it's a remarkable piece of work. The hull casting is beautiful, and the sails and shroud/ratline assemblies are photo-etched brass. The kit is intended primarily for wargamers, but could be made into a really impressive waterline model.
There are quite a few wood Victory kits. Most of them, in terms of historical accuracy and quality of materials, are junk. (That's a personal opinion, but I think most serious, experienced scale ship modelers would agree.) The great exception is an enormous, 1/72 scale kit by the British company CalderCraft. I haven't seen the kit itself, but I have seen pictures of it on the web and in magazines. From what I can tell, it's superb. The bad news is the price: over $1,000.
The Victory kits I can recommend are those by Heller, Revell, Skytrex, and CalderCraft. The larger Airfix one almost makes my personal list, but the shape of the bow bothers me.
Hope this helps. Good luck. It's a great hobby.