i've ordered bio-spira from dr. foster and smith and it worked out great!! Yes it is very expensive but it saved me from my ignorance about the cycling process at the time. Not to mention saved my fish!!
If I were you (and if you can afford it) buy an extra package of it or two and keep the extra ones in your fridge. After you add the correct dosage for your tank along with your fish... be sure to monitor ammonia and nitrite levels closely. If you see a spike in either over the first week or so... add the extra dosage of bio-spira.
It seems that the nitrite eating bacteria can die off before the ammonia eating bacteria can turn ammonia into nitrite which will cause a spike in nitrite. I'm not saying that this will happen for sure but it has happened to me and the extra package of bio-spira came in handy once nitrites were present.
Dr F and S will ship it overnight in a box with cold packs, but if you are going to be at work with nobody home... you may want to leave a cooler outside with a note for the delivery man to put the box inside of it... or at least tell him to put it in the shade or something. The cold packs worked great... but I'd rather be safe than sorry, especially after spending that much money on it.
Couple other notes:
Don't skimp on the fish... especially with a tank that size... if you don't have enough fish to produce enough ammonia, the bio-spira will die off completely and be useless... that being said, don't go over board... 10 or 12 sub-adults might be a good place to start
Also... water must be dechlorinated before adding bio-spira... it will die from that too