I have many times in the past but not in quite a while now. Just keep an eye on peoples feedback. For instance I bought wild Lwandas from a guy on there who has a well know import business(forgot the name) his feedback was 100% out of over 500 transactions and successful shippings of fish. Needless to say I was very confident my fish would arrive alive, and they did, I have dealt with them direct a few times now.
Another time a guy had decent feedback but not 100% He didn't list his shipping price and didn't respond to my msgs. I wanted the fish bad and he was in Illinois so I thought fine I'll buy it how bad could it be he's practically a neighbor......... $117 to ship overnight from Illinois for 12 1" fry!!!!!!!!! I went 2 day which I hated to do and I am not sure the guy could have shipped them successfully overnight as in 2 attempts all arrived dead!!!!
Just watch peoples ratings and don't deal with people who won't answer questions and it is a great site with many species listed