Tradtech Trident risers are real nice. There's knock-off's on ebay for under $100 if you're not wanting to dive all the way into a $300 riser. I think they're 17". Otherwise the Tridents come in 17", 19" and 21" I believe.
The White Feather Lark is another great choice. Comes in 17"-23" in 2" increments. Just under $200 on that one. There's an ebay knock-off for it too, around $125, in 17". I have one of those. They're ok. Grip needs some reshaping imo.
Dryad Epic is an AMAZING ilf wood riser. Yes, I have one of those too. Definitely my favorite. New will run $450+ pretty easy. Used I've seen them in the $250-$350 range. Can't go wrong there. Just make sure you know what kind or style of grip you want. They come in 13" - 19" in 2" increments.
OMP, Farmington and Mandarin have some wood risers too but I can't speak on them.