Understandably, Kyle Schwarber Rookie cards are extremely hot right now. From the 2015 Bowman Prospects base card to the various limited edition versions from the 2014 Rize Rookie set - there are options for any baseball card collector's budget.
One of the most affordable Schwarber rookie cards you might consider is 2014 Bowman Draft Picks and Prospects #DP2. The base card edition sells for only about a dollar, plus shipping. If you want a limited edition refractor version of this card, the Draft Picks and Prospects set has plenty of them to choose from.
Another popular Schwarber rookie card is 2015 Topps Pro Debut Baseball Card #100. This card depicts Kyle at one of his minor league stops, the Boise Hawks. It lists for about $4-5, plus shipping. There's also a short print Distinguished Debut insert of him in the set, as well.
Kyle Schwarber looks like he'll have a pretty strong career, especially if he can eventually stick behind home plate for the Cubs. It's probably a great time to jump on the Schwarber RC bandwagon if you're a serious baseball card collector.