In case you're interested, Hire for Baby quoted me $99 for a 6-month hire for 1 seat and if you need to upgrade to a bigger seat during that time, you just need to pay a cleaning fee of $10. I have a feeling though that someone will end up loaning us either one or both seats we need because all of my friends are asking around but it's still nice to know we can afford to hire them if we need to. I also noticed a good deal on their site for $170 you can get a baby capsule and upgrade it to a convertible seat at 6 months, or whenever you need to, and then at 12 months turn it back in. Then all you have to buy is a front facing seat that can be converted to a booster seat at 4 years. It sounds like a good deal if you don't have your kids really close together since the laws always seem to be outdating car seats.

Thanks again for all your help!