Shoes for toe-clip pedals are still made (Reynolds in England and Marresi in Italy come to mind), but they are a niche market and priced accordingly. Fortunately, old stock shoes of this type turn up regularly on eBay and can sometimes be gotten at fire-sale prices at your LBS if they've been around long enough to have stock gathering dust in the back room. It helps if your feet are outside the popular range (43-47) as the popular sizes are less likely to be available and vendors are less likely to sell them cheaply.