Just want to share my experience.
hotbuy4u is fine, however, their customer service is very slow. the other disadvantage is that, their inventory goes very fast, make sure you check it everyday or subscribe their daily update email. otherwise, you will find that you don't have the item when customer buys it from you.
MK Enterprise is hard to sell at ebay, just because the profit room is very low or no profit at all. lots of other HK sellers can beat your price very easily. you need to calculate your cost before listing on ebay.
you may need to try small bulk order, that may help, but you need to manage it.
Direct Buy For You Online Store
Link hidden: Login to view