Hello orchen,
There is a simple explanation for this: Wholesalers don't often list their bulk prices on their website. You will need to login or contact the wholesalers to view prices. Wholesalers do this to protect retailers like you.
It's so worth spending 5 minutes to sign up with wholesalers (or email them directly) and see how much the items are at different order volumes.
Try that and let me know how it goes. If you need help finding more suppliers, just let me know and I will run a search for you.
Cheers!