71% Odds of At Least +45 Seats for Republicans
The chart above is from this website and summarizes the current Intrade betting odds for various gains in House seats for Republicans. Intrade contracts which are trading above 50% odds are shaded dark red, and contracts below 50% are a lighter shade. As of today, there is 71% chance that the Republicans will gain at least 45 seats.
The same website is showing a net gain of 8 Senate seats for the Republicans (AR, CO, IL, IN, ND, PA, WI and WV). Updated: It should be AR, and not AZ.