As someone who just started out collecting a month or two ago, here is my advice (I realise you didn't ask for general advice but I figured I'd share):
1. Buy singles (as plenty have suggested here), you can get very good cards that you would chase in a box or break for good prices at auctions.
2. Boxes are terrible ROI, you basically need to hit a decent numbered card to get value and you can be left with plenty of base cards. Good feeling opening them but deflating when you hit nothing and have paid a premium price for the box.
3. Breaks are super fun and well worth the $ imo, you can shop around to find the best value. Some US based companies are better value with AUD reasonable against USD and do free international shipping (or use ShipMyCards to make it decent still). It's easy to get hooked and not all breaks are created equal. My personal fav is Bomber breaks, they have a great format and I like the dude who does it (I am not affiliated).
4. DYOR - you can save money in this game if you are willing to research new pathways to getting value. I am constantly engaging with people on Social Media, marketplaces, forums etc and have picked up cheap singles and boxes that are well below the going price.
Any queries, hit me up on DM.