of payment ?We have large quantities in Stock for normal color,Normal size ,for special color and products sizes it need to 3-5 days to customize.50K units is available for most of our models in normal color and sizesThe payment can be T/T transaction, Letter of credit,Western unio.3. Shipment will be over sea or by air ?Generally speaking ,we ship the products by DHL UPS FEDEX express since the products isn't too heavy for the transportation.4. Could you please send me the sample for the same