C.J.
Kelly,
Another option that my sister and I did, don't buy a double stroller at all. They are big, bulky and heavy. Instead use whatever stroller you use with your son now and use a sling or a bjorn or whatever type of carrier you are comfortable with. By the time that your 2nd is old enough to be out of the sling/bjorn (even say at 6 months), your son will 2.5 years or older and may not be willing (or fit comfortably) into a double stroller. My friend insisted on doing the double Graco Duo and she only used it for 6months before her oldest was too tall!!
I will tell you that by 30 months, my son was done with the stroller entirely!
You are not running out of time, it is the baby stores that are trying to make you spend money before you need to!!
Good luck finding the right solution for you. C.