Cheap place to buy fluid ?

I usually order fluid from RRE, exp : Red Line Shock Proof...... , is there any other site that sell cheap, then RRE ? thanks. The season I ask because, remember the dealer told me that, they gonna repair the tranX case leak, well it been 3 week, and they finally told me bring in tomorrow. in those 3 week I been refill my TranX case with red line shock proff, and mix those with tranny, so last 3 week I been using 4 quart :shakehead .