Open Question: Please answer my CONDOM QUESTION.?

My boyfriend and I have been dating for a while now. We are very sexually active. And we do use protection. Not always, but sometimes. When we do use them however, I get swollen and sore for days. I think I'm allergic to latex condoms. I've heard that there are condoms that are non latex. Where can you by them. ? And are they expensive. ? (: Thank youuu.