Car seat issues for foster children

I start my Pride classes on Wednesday and I am so very excited. Ok well my husband and I were thinking of different things we needed to get the room ready. We are doing foster to adopt for infants to 3 yrs old. How do you as foster parents deal with the car seat issue? Obviously for an infant you would need a infant car seat and toddler for an older child. Since you really dont know what you are getting til you get the call what do you do about this? Thanks. Kim