I prefer the look of the stamp over the sitcker.
I use two rubber stamps on all of my handstamped items.
I don't own the rights to the images I stamp, many of them are Stampin' Up stamps.
One says:
Handstamped by N.C.Meyers
(picture of a tag)
copyright Stampin' Up
The other stamp has my shop web address, so the recepient can see where the card was purchased
www.woodstreamdream.etsy.com
I know that Stampin' Up offers stamps reasonably (I paid about $11 plus s/h & tax for the one-line stamp) Then get a pad of staz-on ink (it's a permanent solvent based ink pad that adheres to just about anything). They offer different sizes for the font, depending on the number of letters you want per line. www.kimmullin.stampinup.net - this is the Stampin' Up consultant I use - it's cheaper to order from a consultant than directly through the website. Custom items I think you have to order from a consultant.
I know you can get custom stamps made at Staples also, or at least you used to be able to do that!
For my felted flowers and crochet items, I use tags that have all the care instructions, material content, and my shop info. I print those on my computer. Like this:
http://www.etsy.com/listing/72235420/crochet-cap-in-charcoal-merino-woolGL with the decision!