I ordered my PP balancer yesterday from Northern Auto Parts. I saw a page they had on eBay and asked them to match the buy it now price, which they did. I got the balancer itself for $58 and the spacer for $18. I'm pretty sure they would have the 28 oz. too, but their "normal" price is high. Search hard on eBay or Google for it, I didn't find mine right away. LRS had mine for $80 with the spacer but they were out of stock. They said they were coming in on February 1 so if your not in a hurry...
I hope this helps,
Gears