Looking to crimp them yourself? Then yeah, just hunt around the web for a spool of 1000m ethernet cable and RJ-45 heads.
If you want pre-made, you could probably get away with cables from a dollar-store.... At least, that's what I did. Picked me up a bunch of 6/10/15/25-ft CAT5e cables and they all run very well. No problems peaking out at about 800mbits/sec between servers.
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