Fully online courses can provide teachers fresh opportunities to expand their mathematical conceptions and infuse technology into their classroom teaching. In this article, the authors share the experience of two classroom teachers (Hornbein and Bryson) who participated in a fully online mathematics education course--Expanding Conceptions of Algebra (ECA)--designed and taught by a mathematics educator (Johnson). Not only did participating in ECA deepen Hornbein's and Bryson's conceptions of algebra, it also influenced their use of online technology in their classroom teaching. The authors discuss how participating in an online course, such as ECA, can give teachers a chance to use online technology that they can then incorporate into their own classroom instruction.