Need advice

I have been breaking my head so much about this i have a year old baby and im pregnant due in june so my question is it worth buying a double stroller im really never on my own my aunt is always going with anywhere and when I grocery shopping my hubby goes so i get help from them alot and i have been looking into double stroller with car seat included which cost about $300 new !! Which in my situation it fairly above my budget i have search on VarageSale craigslist and i have some but they are so used for the price also !! So i really need some advice thnks