I think $449 for the Ironmaster adjustable dumbbells is a good deal and well worth the investment. That includes the weights up to 75lbs each and the stand.
You can purchase the add-on kit if necessary, or get a package deal including the Super Bench (which is a bargain for the price - it’s sturdy, high quality and is a flat/incline/decline bench) including various attachments for $899.
That alone will give you plenty of exercise choices and make a very nice home gym. A power rack could be added later along with a 300lb Olympic barbell set. Or you could start with that stuff and add the Ironmaster dumbbell set and Super Bench later.
If space is an issue, and you want to train at home, I think the Ironmaster package #4 (Dumbbells, stand, super bench, dip bar, chin bar, leg curl/ext attachment, ab attachment and seat) is a great buy and will be well worth it in the end. For less than $1,000 you’d have a very good home set-up taking up less than 6’x6’ of space in your house or garage.
Sure, heavy leg exercises would be hard to do with just that package, but you could always add a 300lb Olympic barbell set to the mix and a power rack (you don’t necessarily need to have a power rack - but it’s convenient for loading the bar with heavy weights for squats) and you’d be well set for about $1,500 total. At that point, you’d need a little more space, but it could all fit in a 10’ x 10’ room. And $1,500 for a GOOD home gym is a bargain!