To the writers here on Tapas/tic who are interested in other options for their writing, Amazon UK has an open $20,000 pound sterling contest. That's about $25,000 USD. There is no entry fee.
Here are the details:
https://www.amazon.co.uk/b?ie=UTF8&node=12061299031&ref_=pe_390220_233700670
Surprisingly the entry only has to be 5,000 words (but can be more).
Hopefully one day Tapas can match something like this.