Austen, I have found Manfrotto fluid heads and fluid head tripods used on ebay, craigslist, etc. The fluid head tripod was about $85, a little above your price point. It took some time and lot of patience. If you have a tripod and the head is removable, you might be able to purchase a used fluid head and attach it to your existing set of legs (some research might be necessary to see if they will work toghether.). Check out Manfrotto fluid head 3130 and see if you can find it by itself or on a set of Manfrotto legs. If this is still higher than you budget, you might try a Sunpack 7500TM. This is a 'fluid style' of tripod that I have used in the past and it gives acceptable results, although certainly not as good as the fluid heads. In a pinch you can always use the rubber band trick on your non-fluid head (check on this sight). Hope this helps. Keep shooting.
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