That is hard to do.
eBay runs so smoothly and is easy to use. That took a lot of work and tweaking and thinking over the years.
www.delcampe.com (or .net) is from Europe and is constantly updating and changing and costs about 5-1/2 % to sell, not to list.
www.bidstart.com is the most like eBay as to looks and how it runs, costs very little to list and in final value fees.
www.wensy.com is free. Free.
www.stamps2go.com is a buy it now site.
These all have their ups and downs but eBay has the most people looking at it and that is worth the extra cost involved. And they know it.
Facebook has been (I hear) having to opportunitu to change into a selling site as well as what is is now.
Google Plus is also doing this. Amazon
and yahoo and others are running their own game.
There are artsy crafty sites that have stamps on them also but mostly as a side line.
probably each country has it's own selling site in it's own language. www.tradera.com
in Sweden is eBay.