I have Olivia who is 18 months, who already had 2 prams/strollers, and we have just had Charlie.

So even though we already had 2 prams, we still needed a double pram for them both.

We ended up buying a Swallow Lite: it only cost about $230, and it is a double limo style (ie the toddler sits up front with the baby behind, instead of side by side).

It is GREAT!