Lets talk planner stamps. I personally own ALOT of stamps. You can say that is one of the things I hoard a bit. I accumulated most of my stamps because I am a crafter. I have been making cards and other craft projects way before I became a planner. That is what I love about planers: I can combine my two loves and "craft" while planning!
There are so many options for panners with stamps out there. It is an investment but what isn't when you are a planner, crafter or both? One of the benefits to stamping is that they are re-usable. A one time investment can pay off. Stickers can get quite expensive to purchase and you can find some very cute stamps that are very functional for the task you may have to mark in your planner such as cleaning, grocery shopping and more. Most of the stamp companies have sets that are themed for the various tasks making it simple to select what best fits your life.
Some of my favorites are Mommylhey, Bella Creationz, Sweet Stamp Shop and the list goes on. Pricing can rage from $8-$18.00 per set depending on size and number of stamps included. I really am a "cutesy" kind of person so my attraction for Mommylhey was inevitable. Lhey is one of the nicest people I know. I love to support small businesses.
Now...equally important are the inks you use to stamp in your planner. I typically use Memento black ink although it does tend to shadow on the next page. That being said all the info I have found on the internet watching Youtube video after Youtube video is that VersaMagic Dew Drops chalk ink is the best for the planners.
I do plan to purchase some of these inks. As I said I love stamps but I don't have an over abundance of inks. I probably have a lot to some people but because I used them on a whole different medium than planners my inks are not the right kind. I am pretty standard when it comes to stamping images. I only like to use black. I can use colored pencils to fill in the images with some color and they stand out better with the black outline. For me, a few black inks won't be a large investment. You will also need a stamping block but since most planner stamps are pretty small you can start out with a small block or maybe a medium sized. I have a set that is graduating in sizes so I can always find the perfect one to use.