Glue or screw, it's up to you . http://www.3riversarchery.com/Broadheads+Points+2-Blade_c57_s266_p0_cat.html
I see prices from $17 to $100+. Now, that can't mean $100 for ONE, and I find it hard to believe that it's $17 for a dozen. How are you supposed to know how many you get for the price? I don't see the quantity indicated? They are quite stupid for not having that be quite obvious to any visitor to their site.
Every one I looked at says either "Sold by the 3 pack" or "Available in 3 pack only". Now, I didn't look at the glue ons or all of the screw ins but I looked at quite a few. It was quite obvious to me when I looked.
Most of the glue-on's are sold in 6pks...a few 3pks. The screw-in's are mostly sold in 3pks. At least that's what the descriptions clearly state
I would look at the Magnus two-blade. Most archery suppliers sell them, and they are typically under $30 for 6. Great heads, and especially if you are looking for a regular two blade.