I was wondering if there was a way to get some loose bows and or quivers to glue onto my goblin spearers. Spider Riders come with some, but honestly I need about 50. Any tips or just pointing me in the right direction is appreciated.

There are a few bits sellers on ebay.

There are also a few bits sellers. (These are UK based but there are others around the world)

Bits and Kits

BitzBox

Model bits

Let the Dice Decide

bows are relatively easy to make with a piece of metal wire and green stuff.

The (night) goblin, wolfboyz boxes have seperate quivers, so you could just ask your local fellow greenskins if they have a few spares.