I have bought eggs from ebay and found them to be fine 60/40 success rate, local sales can work out expensive as well, but take your chances there. or go along and chat with the sellers at the market and get a deal on some fertile eggs from them at least you will know where they come from and that they are fresh.
i use the Rcom suro20 which i have had a ot of success from, if i can help in anyway please give me a shout....... amundee@btinternet.com