I've made two separate orders from aquadisestore and I have never had any problems. The feedback rating does indicate that some other members have had problems (and you have to remember that since most people buy multiple plants at once, many times 4 or 5 negatives come from the same person who just got one bad shipment), but for me the low cost and free shipping makes it worth the risk. The fact that I've had nothing but good experiences with that seller just means that I'll definitely be going back for more.
PS. - On both orders that I made he has thrown in bonus free plants as well that I didn't order.
PPS. - Notice also that most of the negative feedback comes during the winter months (of his 91 negatives in the past year, 90 came during the last six months), so with temperatures warming back up again things should be more reliable.