O dear, sorry to hear. Opening the incy may have contributed to its demise as it would have made the environment for hatching unstable. I'd always advise to candle earlier on and in the last days of incubating to not open the incubator at all to ensure it remains stable as possible.
With regard to bidding on Ebay, personally, its dodgy ground. Unless you know the seller to be reputable and breeding decent stock I'd advise against it and to buy privately from a local breeder you can visit and whose stock you can see. Or buy from someone on this forum who others have bought from in the past and have given good feedback on. I've bought eggs from people via the forum before and always had good hatching results. So I'm always happy to recommened sellers on here if I know their stock to be good or others have said so.
I can personally recommened this breeder. She sells her eggs via Ebay also but you don't have to bid. Just buy at the time
http://www.brbpoultry.co.uk/sale.html
Her birds are well cared for and good examples of their breed. All what I consider good breeding stock. At the moment she would appear to not have hatching eggs but may have some in the near future. I'd drop her a line and enquire.
Also post in the eggs for sale/wanted section of the forum and see if anyone replies. You can then read round the forum to see if there is positive feedback.
We also have a list of 'good' Ebay sellers that members here can personally vouch for as being good fertility and stock etc. Although some of them may have only bought one batch of eggs but have had good results. Does not mean they have repeatedly bought eggs and had good hatches. But still, its good to know their first attempts were positive. Others have bought more than one batch.
http://poultrykeeperforum.com/viewtopic.php?f=21&t=869&start=0&hilit=good+sellers
I"d be wary of bidding on any eggs on Ebay as you really don't know what you are getting. If you are bidding on some rare colour or hard to come by breed, you may end up with poor quality birds or infertile eggs. It really is hit and miss.
We've had a bit of success with previous batches (1 Silkie, 2 New Hampshires, 3 Choc Orp banties 1 Poland. But this lot has been a disaster. Should I carry on? Am bidding on 4 new lots on eBay.