Head to an Office Depot or Best Buy, they always have the cheapo laptops for $300-$500 with spinning drives.
Gaming laptops that have dual drives, will still usually come with the 2.5" slot.
Sometimes, gaming laptops, their 2.5" data drive bay is unfilled and just comes with the 2.5" adapter/enclosure, just in case the owner does want to install a SATA drive into them.
Edit;
Yes, also, anticipate 7mm SATA in slim laptops, and possibly the potential for a 9.5mm SATA in gaming/workstation laptops.