Hardware manufacturers

Hey all,
Im currently looking into starting a net bussiness selling computer hardware, mainly casing.

My problem is that i cannot find a manufacturer who could supply me with the hardware, ive contacted a number of companies without success. Some of the places i contacted said that i couldnt buy there products in bulk for cheap and re-sell them, others said that they dont make their cases they buy them from a manufacturer but wouldnt give me their manufacturers details. So im stuck on what to do.

Ive searched on the net for the past week and havent found anything....i was just wondering if anyone knew of any smaller manufacturers who would be interested in my company selling their products?

My other option is to buy components and sell completed systems....but im still pondering over that idea....

....any help or advice would be great, thanks.