Shields do a great job of keeping Refs detached from the game and let them get more easily distracted.
If a ref is standing off the edge of a field they should be able to keep themselves out of the line of fire if they're paying attention, and a shield has no place on the playing field as it makes a larger defined shape that makes it easy for players to use the ref and shield as blockers.
Ref reaction time is also reduced as they can't just run out and check or pull a player when they've got a shield on their arm, they have to detach it from them self, make sure it's set off field and then run into the field and hope the player hasn't moved.
So, the question comes down to: WHY do you think you need a shield?
i know you can buy like replica Police riot sheilds online but theyre like 80 bucks a pop and weigh a ton
...then I busted to the spike and shot like 83 guys...wiped five hits...bonus balled 3 rentals in the dead box...and punched a little kid in the face.....then proceded to bang megan fox midfield to the tune of the national anthem.
IDGAF if your under 18 and you pay for your own ****...
Shield? WHY? a towel maybe would work better, but if you stand in the right spot you shouldnt need any of it...
I'm the voice inside your head
You refuse to hear
I'm the face that you have to face
Mirrored in your stare
I'm what's left, I'm what's right
I'm the enemy
I'm the hand that will take you down
Bring you to your knees
Finding a riot type shield isn't going to be cheap. Most referee's use snow sled disc things and put arm loops on them IF they use shields at all. Your best bet is to use a large beach towel of some sort. If you want it to be shield like, find a way to build a "stand" for it and hang the towel in the stand. Otherwise you really shouldn't bother with them at all. I don't think I've ever used a shield of any form outside of a dust pan to protect the unmentionables and other sensitive areas during a check.