I'd like to add an MSRP (Manufacturer's Suggested Retail Price) field to product listings. Preferably, admins would enter the value just the same as the price field - just the number, no dollar sign or commas, and it automatically formats appropriately (e.g. "1500" => "$1,500.00"). I'd also like the text to appear somewhere near the store price, probably right beneath it.
What's the best method to achieve this?