Why wont nook replace any of the tools everyday he have at his shop?

I started playing the game 4-5 days ago and only have a watering can, shovel and fishing rod, and those are the with the sole purpose things he has had for the last 4-5 days, i really call for a bug net and slingshot but everyday i go to his shop but he has indistinguishable stuff he had yesterday, do i need to re-buy the stuff so he can get current stuff, he replaces his misc items though.

Thankyou
Answers:
you have to of played the game for about a week or so to tolerate him upgrade otherwise it wouldn't really be a real-time game will it?
heh heh u need to upgrade your nook store for better items ok just buy em out and after awhile he'll report u hes renovating the next day and he'll b closed so ya it seems uve be buying from him so he'll renovate soon k


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