I see that there is a statue of St. Valentine sold on the web but it appears to be a generic saint statue that the company markets as several different saints by simply changing what item the saint is holding. That is extremely annoying to me and I would imagine to you too. For 75 dollars or whatever I don’t want St. Valentine to also look like St. Richard, St. Eugene, St. Wolfgang etc.
Unfortunately it’s hard to find statues of more obscure saints without paying a good bit of money. If you are okay with a primitive statue, like a painted “peg doll”, you could try Etsy; there are a couple of St. Valentine statues over there. Otherwise I would recommend you look for an icon. For some reason it is easy to get cheap little pasted-paper icons of even obscure saints.