Hokendauqua Trout unlimited chapter starts their big tying class this saturday,probabaly the single best class in the state an for the money if you want a deal in learning to tie flies this is the grandadddy of em all. youll have to go to the T U site an look up their president perhaps they can get ya in i know it runs for like 8-12 weeks an they pretty much cover most tying skills in that time .also they can tell you all the details.
BPS runs classes through the winter. Not sure if Cabela's offers anything similar or not. I see you're in the Lehigh Valley and can only surmise you want to stay within a reasonable driving distance.