An example could be this guy selling posters from the UK for $20 - $35.
http://cgi.ebay.co.uk/Polish-Travel-Art-...VQQcmdZViewItem
He seems to sell a lot, it would be very easy for me to get similar ones printed off either of any variety, or specialising such as Polish Propaganda etc
http://www.poster.com.pl/poster-2.htm
Basically just see what others are selling well and sell similar and a wider range but at a lower price as my outgoings would be a lot lower.