Two Guys is a great shop, especially the one in Nashua. I've never had a problem there, and they do NOT gouge on prices for HTFs. They have a nice VIP-type club setup as well, where you earn points per dollar spent. Also have some really nice employees who will remember your name, first and last.
I didn't know they had a VIP-type club, what does it take to become a member? That's one of the nicer shops in the area so it would make sense to take advantage of any deal they have.
On a side note not sure if you are ever in the Bedford area but there is a nice shop called Blowin' Smoke, great service, not 100% sure on the prices yet but inside has a lot of places to sit and relax with some good people.
I don't think it takes anything to join, but I am not sure, since I have been a member since opening day, when they were signing people up left and right for free. Basically, they track your purchases at the store or at other 2guys for a year, and you earn points per dollar spent. Something like 500 bucks = 50 dollar giftcertificate or something of the sort. I ended up saving around 2,000 points and getting a box of Padron annis... Which I somehow smoked already.
EDIT: We should meet up at 2Guys sometime, if you are in the area.