Obviously it'll vary, but I was just wondering if there's a general guideline on how much horses with a certain region of points is worth?

The horse market of buying and selling is a little hard to just pin point a certain pricing guide.  There are many factors that play into it

• Popularity of the breed
• Lines
• Points

As a rule of thumb I sell all my back ups that are born with points under 100k for 5 mill an animal.  My 100% privately trained andalusian or friesians that have babies born in the 300k-400k range have sold anywhere from 50 - 150 mill.  It's all really relative to the current market.  Your best bet is to just put them up for sale, advertise, and see what people are interested in! ☺