From the newegg they are

OC Board $419.99 including tax & shipping to me. This has $8.50 for shipping
UD5 $308.50 including tax & shipping to me. This has free 2 day shipping

Taxes in California are getting pretty high these days

This is a nice board for sure and has some very nice features and I suspose with markets these days things are costing more. UD5 is prolly stock they have had for a long time also and OC is bran new so... but over $100

I don't know, with the price of motherboards these days I am picking what I want/need pretty carefully. I used to go for boards like UD7's, but now UD5's or UD4/UD3's are doing what I need just fine.