Roma do a nice pair of inexpensive tendon boots which I LOVE.......Mainly because they have a strip of diamante along them so I can make my horse look a little bit more gay
I also have a pair of eskadrons which are very hard wearing. I use them when I'm playing polocrosse and they're lasting really well, they've done two seasons and they're yet to get smashed up like a couple of other pairs I've had.
Eskadron flexi soft tendons are brill, but i LOVE my dalmar Open fronted tendon boots with the matching fetlock boots. They fit really well and are easy to wipe over. worth every penny