I ordered the smaller 600 GPH intex pump off ebay. Brand new and $35 delivered. Only 80 watts and it pumps up to about 7'. At 5' I can get around 10 GPM which is plenty for 10 barrels. Even if I have to replace it every year, it is a bargain.
Watch for season close outs of the 8' intex pools with a pump. Probably get them for $50 about now.