It all depends where you live and if you have good art and craft stockists near you otherwise there's a wealth of suppliers on line.
Here are a few that I use, just click and you will go directly to their web site.
http://www.saa.co.uk Get a FREE copy of paint magazine simply by sending a postcard with your name, address, phone number and email address quoting PROMO CODE JL2222 and send it to: SAA PO Box 50 Newark, Notts, NG23 5GY UK. It is a useful society based in the UK but also has overseas members. Members receive a regular magazine, news of events and the opportunity to purchase great value products especially sourced for the SAA.
If you want something really specific, this company in London, have the widest range of supplies I know of, and ship worldwide. Just click on the logo on the left and you will be taken directly to their page. Happy shopping.
http;//www.cultura.com For those of you who live in France you may have a branch of this store 'Cultura' near by. It's a national company which stock a good selection of art and craft products.
If you're in the USA :