I shop like Tom does. Our local plastic pusher is a ModelKing surrogate, and we usually can't beat his prices.
However, I always carry a 40%-off coupon when I wander into HobbiusLobbius or Michelle's. If they have a kit I can't live without or I need another in order to live life to its fullest, then I might use the coupon for that. Otherwise, I feel their 40% off is still a little high because they start out so high.
I usually use the coupons for tools or supplies or something nice for the Lovely & Gracious Mrs. B.