If you are investing through fiat the best place to go is @steemmonsters

@steemmonsters cards are priced in USD. My cards ended up being more price stable than SBD (with few exceptions) A booster Pack is $2 and you get at least about $0.5 worth cards (5 cards per pack) and you have a chance to grab Epic, Legendary and Gold cards that could easily worth over $100 at times.

The game itself is fun to play and spending 20-30 minutes a day can get you to win Rewards cards which are also collectibles. If you spend $100 you get $10 worth SP and under absolute worst luck $25 worth cards. If you were lucky you could end up getting $10,000 worth cards. There only limited amounts of cards available. So their worth could actually increase in the future.

Happy Steeming!
Official wesite
View collection: https://peakmonsters.com/@username/collection