Pre-Order means making an order together with our stock-take dates. Normally a discount is offered due to your patience and 

Firstly, add Pre-Order items to your cart. Once you’re ready, checkout and make payments. Your items will arrive to you in 2-4 weeks after the Pre-Order slot closes which is every 15th and 30th of the month

They close every 15th and 30th of every month. So you can place a pre-order anytime before these 2 dates

Your pre-order will arrive to you in 2-4 weeks after the nearest closing dates (15th or 30th of the month).

Yes, you can. However, all items will be posted together after the Pre-Order items arrive. If you need to receive the Ready Stock items first, kindly make another purchase order through a separate checkout.