A Cat 5 cable doesn't need a powered hub or a booster station because it should be good for up to 100-200 metres without transmission loss. Over that and you need active hardware to keep the signal at full strength without loss of strength. Most of the loss is due to crosstalk between the segments of the cable and the possibility of some outside interference.
Best place to get lengths of Cat 5 cable that suit your needs would be Jaycar.
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