PS/2 BARCODE SCANNER INTERFACING

Hello everyone, i want to ask something about a barcode.
I am working my final year project on a library management system which need to include a barcode reader design, now what i want to ask is, i really want to find a barcode reader/scanner module which has a ttl output (binary output) then i will get the ASCII using using arduino then send to my C# code on my Pc (it isn't a problem i will do it easly).
(i.e i don't need a barcode reader with final output!!!)

I have arduino uno and mega micro controller.

Anyone who have an idea let me know where or how i can get such kind of module please.
10x in advance and thank you for your time.