where to buy exotic flowers

Hello Houstonians! I was wondering if anyone knew where to buy inexpensive but pretty flowers in the Houston area or online. I am looking for pink and/or white hibiscus, orchids, and lilies at a reasonable cost. I would want the flowers not in bouquet form but instead in like bunches or individual ?stems?. I don't care if the flowers are real or not. Is there any in person stores that sell these flowers, or should I order them online at Amazon, Hobby Lobby, Arnies, etc. Thanks!!