Vintage beer coasters

Hi guys,
I’m after any thoughts on prices and demand for the following. I saw on eBay That some individuals sold for $5 each. Then I saw a lot of 18 of the Panthers ones sold for $500??? I’m keen to sell I just don’t want to give away a bargain for someone to on sell. Any input appreciated.

Hi, I’m interested a in a few of the penrith ones. Are they available?