A question about stroller

Hello, my name is Amanda. I’m new in this forum. I hope that you all will welcome me here. I’m a new mother who has no experience in being a mother. I couldn’t even prepare a stroller before giving a birth to my little miracle. Not long time ago I realized that I need to buy a stroller and go for a stroll with my beloved one. But I didn’t know that there are so much different strollers. Actually, I’m looking something like these strollers. I wonder if someone has similar stroller and could tell me more about it. Also, I’m really concerned about the price. Could I buy a travel system stroller cheaply? Or maybe someone from you have it and is selling it?