mousy_in_canada
the best category of fares is usually the "internet only fare" which are not always posted when the schedule opens up and which, sometimes, are for a very limited amount of time
the internet only fares seem to be available on a vast majority of the flights when they are listed and in particular do not seem to be connected to a particular day of the week like the promotional fares are sometimes )
the most recent lowest fares in that category have been the 49$ one way fares but that was only good if you flew before september 30th
for the rest of their schedule the lowest fare right now seems to be 59$ depending on your travel dates, this particular round of internet only fares ends august 5th if i am not mistaken
on a side note:
after september 15, they seem to have two non stops daily for buffalo
........one in the early morning and one in the evening outbound
.........one in the morning and one in the afternoon inbound
with respect to when your dates will open up, no one really knows but SW ( within the last couple of weeks they have opened up their schedule twice, once to december 11th and now until jan 14th )
make sure you sign up for their tuesday update, it will inform you via email each week what is happening at SW