I have all Radians in my van .... best investment I ever made because they are so versatile with rear facing until 35 pounds and forward facing until 65 pounds .... I have had 3 year old still able to rear face at the parents request in them and on flip side still had 6 year olds still able to sit in the Radian comfortably so not need to swap out for a 'booster' seat.

One of the things to remember when comparing costs is that most cheaper car seats only have a 5 year expiry date ...which is fine for 'personal use' because by 5 years they have outgrown a carseat and more likely in a 'booster' but as a business in 5 years you'd be replacing all your seats

The Radian line of seats because they are made of stainless steel verses 'plastic' has a 10 year expiry date ~ and as these are for business use verses personal you will get TWICE the use out of them because the kids do out 'outgrow' them so over the long term they are CHEAPER option ... unless of course your business plan is to just be in this for a couple years