I have a spare nickle I'll give ya for free. Shipping = $10Front sights were/are rarely sold separately; they were considered part of the barrel. I have made decent replacements by flattening a nickel coin, grinding and filing to fit, then pressing into the slot. It might not hold up to much shooting, but it will look OK, and won't cost much.
Barrels and other parts can be found on ebay quite a bit.