I have a Goya that's more a "standard" size than a "Concert" or "Grand Concert" size. I don't know the model number, and it's from a few years back, so something like it may be hard to find, but it's pretty nice and not expensive (though, since I got it used, it may be hard to judge that). I paid $130 for it, I think.

What you're looking for would be what's considered a "parlor guitar," though many of those on the market are steel-strung, not classical. I don't know the exact make and model to look for, but there are many, many guitars "out there" in the market, so keep looking, and try "the Google" for "nylon parlor guitar."

Good luck.

Bob