I've used Algaebarn with success, however they use USPS for shipping and both times my packages have taken 4-5 days from Colorado to the Chicago suburbs, which is excessive. Regardless, the pod and phyto shipment arrived alive despite the delay and I was able to start my copepod cultures using their apocalypse pods (Apocyclops panamensis). Never had to use it, but I hear they're really good about DOAs if you're worried.
If you're trying to culture phyto look into mercer of montana on amazon instead, you can get a culture concentrate and the f2 fertilizer for less than $30. That's what I'm currently using for my phyto culture. Pretty sure Algaebarn only has mixed species phyto, which is great for feeding your tank, but you'll want single species for a culture. Same concept applies to copepod cultures - single species.