I'd recommend indigoblu.com for stamps, they have really high quality and beautiful stamps.
They have a very vintage/english feel to them. They have especially wonderful Christmas stamps. I'd also recommend scrapbook.com com. I know it's generic, but they have a lot of great stuff.
I really like the brand DCWV (Die Cuts With a View) for scrapbooking paper because they have such comprehensive sets.A lot of Jim Holtz' stuff is good too! Scrapbook.com has all of those things. I feel that Stamping' up is over priced...Lawnfawn.com has some really cool and fun alphabet stamps too.
For me the problem isn't getting more, it is using what I have without forgetting that I have it.
Inspriation is more important in this case.
For inspiration websites like craft tree have an ubundance of ideas for various projects that can give you the personal touch that is worth more than money.
Everything else craft related I have used Amazon. Sometimes Etsy has cool supply stuff too. I needed turquoise skull beads once and Etsy had them!
Now the only thing is that I need to make space for the stuff that I actually use.
I'm also way into crafting (sewing, quilting, jewelry-making, and many miscellaneous other things), and konmari'd my craft stuff last month.
- got rid of anything too old to be useful (adhesives/paints/etc that were dried out, etc)
- let go of anything specific to a craft that I don't realistically see myself doing within a year. If it turns out I do need it, I'll buy it again.
- kept everything sewing-related (my #1 craft), except fabrics I don't like
- kept paints, pastels, pencils, drawing paper, because I do use them occasionally and they're nice quality
- kept tools (like my leather punches), because they're expensive to replace
- let go of things that were purchased because I wanted them and not because I planned to use them (I had so much ribbon, and I don't even use ribbon)
- let go of what felt like 2 or 3 pounds of those glass craft marbles
And I did all the decision-making at once, and then when I put everything away, I made sure to keep similar items together.
I've found that my taste changes and if I hold onto fabric (or beads or art paper) for very long, it no longer does anything for me. You'll never not be able to find fabrics, yarn, and stuff that excite you. If you looked online right now, you'd probably be able to find lots of stuff you like way more than stuff you've had on hand for ages.
Once I used vertical storage and got everything put away, it took up way less space and I now know where everything is. I also put label stickers on all the tubs/containers/drawers, listing the contents.
Also, I'd check all non-refillable markers to see if any have dried out and I'd photograph sketches in half-empty sketchbooks before tossing them.
I don't even want to talk about Konmari-ing yarn and fiber.
I just can't part with yarn.
Oh, and I'm going to a yarn convention in a few weeks.
What could go wrong?
I find it helpful to do hard categories like craft stuff only after you've built up momentum from easier stuff.