New rules for using child restraints and booster seats

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Does anyone know the details of using booster cushions? We have an old one that complies to the current standard and the website says you can't use a *current* booster cushion but you can use an old one that complies to the current standard before it changed.

Otherwise I'm going to have to stop driving places soon, unless we can find a small booster seat. Right now our only options are to find some place that actually sells a narrow toddler seat or to buy a $500 crappy old bomb of a car until we can save up enough money for a good car. Or stop driving places with three kids. Or convince someone to buy our house so I can afford a good car (our old car has about $0 trade-in value, it has extremely high mileage, at least 3x higher than the same model car is expected to have).

They give compensation for everything else, why isn't there an 'upgrade the safety of your kids' grant for parents who can't afford a car that fits modern car seats? I think we'd be less safe in a $500 clapped out old bomb than in our current car with no toddler seat or just an old booster cushion.

Edit: if the eldest kid grows anymore (right now she sort of tucks under the sides of the baby seats, which would probably sever her arms in an accident) we won't be going anywhere for xmas unless the relatives come and pick us up. Which, given past behaviour, won't happen.