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Thanks Brad and I agree.  By the way, we are required to state the term of this sweepstakes (by law) which is in our official rules but I don't think we'll use the counter widget. We are also offering over 10 prizes along the way whenever a certain milestone is achieved.

For one, I find it highly unlikely that any of these big players would ever publicly release anything related to that information. So I doubt there is much along the lines of conversion rates for sites you mentioned. However, big sites like those, especially overstock, aren't worth looking at anyway. They sell products that range from less than $10 to over $1,000. Conversion rate is heavily influenced by price. A site that only sells pool tables will be lucky to get conversion rates above 1%. A site that sells T-shirts for $3 is likely to get north of 10% conversion rate. So even if we knew a sitewide average conversion rate, it wouldn't tell us much as some product pages could be much higher and some could be much lower.