Oh the name of these!!! Most people don't know the proper name of antimacassar for this and I will take the time to explain! Back in late 18th Century and 19th Century it was the "in" thing to oil ones hair with macassar oil. You can see how this could "soil" or ruin upholstery (as well as clothing). So cloths were put on the head and arm areas of upholstery to preserve them and the small cloths could be laundered regularly. They eventually became known as antimacassars.
In my area the prices for these are going for:
FINE lace armrest covers only $8 - $12
Your tablecloth (if in great condition) $20 - $30
The embroidered antimacassars 3 piece $12 - $18
and larger set would go for $18 - $24
Unfortunately/fortunately crafters are acquiring them to make into quilts, purses, aprons, etc.