I just moved to Manchester - I had the same thought. Email Dave Chilson & ask if he has any options...
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Jon's (http://www.littlesalmontackle.com/) should be able to set you up nicely then.
If you don't mind a 20 minute drive, you've also got my favorite pick - http://www.allseasonssports.com/ and Fat Nancy's right across the street - http://fatnancystackle.com/
Tight lines & post how you make out...
You're timing it well - the bigger fish are just starting to show up. I forget where you're headed but the local shop will definitely be worth a trip, both for the tackle and for the latest info. I'm jealous - I'll be in New Hampshire by then...
I fished it a few years ago while staying at a place on Moon Lake. The fishing was good but there were snakes everywhere in the shallows - hundreds of them. Made launching the canoe interesting...