Quantpedia
More than 800+(!) of these strategies are fully detailed with QuantConnect implementations and out-of-sample backtests!
The pricing ranges between $450 and $799, based on subscription length (3, 12, or 36 months). My recommendation is to opt for the 12-month "Pro" membership at $799, which includes the out-of-sample filter.

Seller: Link
Price: 799$