Value has little to do with price when it comes to shoes. Different brands fit very differently, and just because something may be on special offer or not, doesn’t make it good value if it doesn’t fit!
Shimano will typically be cheaper than most of the major players though, and if they fit well, they’re a good quality shoe. Too wide in the heel for me on a road bike though.
Not tried them, but CRC have a load of Diadora’s cheap right now. Might be worth a punt as I’ve heard great things, but obviously you can’t try before you by, so be prepared for them not to fit if you go that route…