Thanks for your responses Jim and Michael! This is so helpful.
I need the n4568 $1 Sands and the n4539 $1 Sands. Is that all I have to do to describe them? Should I post a request for them with the number in the subject line?

I'm not sure if the red $5 Sands on http://www.silver-state-treasures.com/lasvegs/sands.htm are the ones I need or not. The problem is that I lost someone’s chips, and I'm going on memory. Are there a lot of different red $5 Sands chips? Does anyone know off hand if n2127 $5 Sands and n2125 $5 Sands (pictured on that same site) are expensive?
Thanks again,
Lisa