I've been using Books on Board as one of my main sources for buying ebooks for sometime now; they have good prices and they're not Amazon! 
However I've just been to their site and found this:
However I've just been to their site and found this:
So I guess it's not just the high street shops that are suffering at the hands of the "Goliaths."Please sign in on the login page to download books you have purchased. BooksOnBoard has temporarily stopped selling books. We are re-structuring to compete more effectively against Goliaths who have entered our marketplace since we first launched in 2006, i.e., Amazon, Apple, Google, Sony and Barnes & Noble.
We expect to be back with our new business model soon. Meanwhile, customers can continue to download their prior purchases as long as the publisher and their distributors continue to make them available – same as always and out of our control. As in the past, it's always wise to download your eBooks as soon as possible after purchase.
Thank you for your support of our store over the last seven years during which we have pioneered many innovations with our customers, including the first eBooks for sale on the iPhone. We look forward to serving you again with an exciting new approach soon.
The BooksOnBoard team