Yeah, I'm sitting on $20 worth of rewards from over the last year or so. My goal is to bump that total to around $50 and put it towards either the Ewok Village or the Sandcrawler.
This is what I do with my Amazon rewards... I let them pile up all year then wait for the bigger sets to show up on Amazon Prime so I can skip the tax.
I managed to buy one of the $400 sets, I think it was the Death Star for about $175, and I got the Ewok Village for about $90. Now I'm saving up points to get a break on the Sandcrawler.