per your mentioning that Amazon is selling f210 at USD 124.
- sometimes, the lower pricing is to reduce some inventory for some company but price would go back higher later on which you can see that all others from Amazon are selling at USD 150+ (whereby Costco pricing is even higher USD 189 per website given you before; now Costco Canada is selling also at CAN 199.99 or USD 186 per http://www.costco.ca/Hewlett-Packard-F210-Dash-Camera-.product.100108380.html).
- price given you is international pricing already which is export price from HK.
- if you can take now 50 or 100 pcs/model x 3 models (f210, f310 and f100), then maybe can try to reduce USD 1 pc. for f310 and f100 as well at ex-works HK => fob HK pricing.