Wedding wands, bubbles, or...quantity?

I would definitely still do 150, it is better to have extra than not enough.

Definitely one for everyone, you may end up with extras but the kids will have fun with those later on!

I would have 1 for every person there (kids and adults) as you never know who wants to do it. Also you can get packs of 100 of the small bubbles in the wedding section at Micheal's and they're pretty cheap.

Go less and keep at the end of every aisle so that guest can blow bubbles as you two walk down after your married. Not everyone is going to use it unless you do glow sticks fir the reception and have the lights turned off and the guests waving the glow stick as you enter.

Im doing bubbles too!! I saw today at the superstore there's these automatic bubble machines for kids! I might get 4 to 6 of them and have certain people make the bubbles for the exit instead of everyone? I dont want to risk a mess and the machine can make a lot of bubbles at once I feel like it will be a better effect especially for photos!

From the dollar store I would get maybe 100 at most? just the little ones. Even look in the kid party section and there could be multipacks for less than a dollar each.
You dont need to have one for everyone... people can share, or some people will be okay with not doing it.