Half price Team Sonic Racing and Sonic Forces from the Microsoft AU Xbox store as digital downloads. Team Sonic Racing goes on sale relatively often but Sonic Forces doesn't and I've been waiting to buy it. Ends in a few days.
My son loves Team Sonic Racing which is well reviewed online and in my opinion much better then Crash Team Racing. For Sonic Forces, although the game has mixed reviews my 8 year old son is loving it and I think it's pretty good.
There are no in-app purchases for these titles, another huge plus as a parent. Make sure you get the free Shadow Episode DLC as it's actually quite good.
Please note Sonic Colors is coming out next month so there could be further discounts to Sonic Forces in particular.
Team Sonic Racing: https://www.microsoft.com/en-au/p/team-sonic-racing/c2q9fw49…
Sonic Forces: https://www.microsoft.com/en-au/p/sonic-forces-digital-stand…
The PC Steam version of Sonic Team Racing is down to only $5.99 at the moment too (note that it ends at 3am AEST on 5/8/2021, in 11 hours): https://store.steampowered.com/app/785260/Team_Sonic_Racing/