HP Print server

I have an HP 1300n printer that uses an hp rtdirect 200m lio print server. The print is not working anymore and after trying a different print server on it (from another printer) it was printing fine. So it looks like I need another print server.

http://h10010.www1.hp.com/wwpc/uk/en/sm/WF10a/18972-...

I have tried to find one online but no joy. It is listed on HP website as discounted. Can I get a similar thing (not HP brand) or do I need to get a new printer?
Thank you all.