New to Typophile? Accounts are free, and easy to set up.
Moo.com have a sticker printing service, http://uk.moo.com/products/stickerbooks.html
where your designs could be easily printed in a cost-efficient way. Thus you could print 90 custom stickers for under GB Pounds £7. Your typeface letters individually could be printed and these could be given as a portfolio example to potential clients.