No money for a book to exibit to your possible costumers? All you need is some sheets of thin pasteboard where fasten your better photos and a box to collect them. About the colors of the sheets choose what you prefer, sure white, black and some different colors more suitable for your pictures.
Cut a sheet for every picture and cut them some inches more bigger than your photo prints. So you’ll have a coloured frame and the space for an eventual title or caption. Obviously I hope your prints are enough large to be admired.
Choose a nice box where collect them and you’ll have an elegant photo portfolio! Moreover easily updatable…;)