It depends on what HP product you'll be using it for, and the percentage of the discount the coupon has. This question is pretty vague, therefore it's hard to answer it.
This answer depends on which coupon website you are using. I usually prefer the CouponMoto where you don't need to remember any code just click on the coupon code and the code gets copied automatically. and just paste during checkout.
Most of the time ATT uverse offers coupon codes that have explicit expiration dates. If you make sure to use the coupon before the expiration date is up, you should be totally fine. Using them a few years down the road might not net very good results.
There are many places one might find a coupon code offering a discount to the Netflix website. In addition to the official Facebook page, one might also find a coupon on a website like Retail Me Not.
There are a number of places where one might obtain a coupon code for Breck's Bulbs, particularly online. The websites Retail Me Not, and The Bargainist have both featured coupon codes.
You can get a Swanson coupon code from retailmenot.com.
There appears to be a $300 HP Discover coupon available, but it requires using a specific link and the coupon code BLOG. You can find the link below.
One can find a Staples coupon code at such places as Retail Me Not and Tech Bargains. FatWallet and GoodSearch are also coupon resources that one might utilize for assisting with frugal spending at Staples.
There no coupon code
It really depends on the store and their policy. If they won't let you use it at the store, you can always try purchasing online using the code.
Pokemon Coupon Code
If there is a coupon code on the coupon then you can use it online. If there is not a coupon code, you have use the coupon at the store.
The coupon that you have must have a coupon code. If it has a coupon code, then you can type it in at the checkout in order to get the discount.