When I started scrapbooking, I had absolutely no money. When people asked for gift ideas for me, I would tell them scrapbooking materials. I saved cards and fliers from the mail and used those to decorate my pages. I also visited discount stores and found clearance items to use for my scrapbooking. I used a glass to trace and cut out circles and Tupperware containers to trace and cut out squares and rectangles. Be creative; you never know what you can use to make fun and affordable pages.
If you have the extra income, it is fun to go to craft stores and browse the scrapbooking sections for stickers, letters, applications and themed paper. I just recently came across a company (Close to my Heart) that has acrylic (see through) bases with accompanying stamp letters to spell out words and dates that has revolutionized my scrapbooking world! If you sign up for emails, they typically email weekly coupons to take advantage of or offer memberships that provide discounts.
You can also form a scrapbooking group to share/borrow more expensive items like punches, stamps, photo printers, and machines like cricut that cut out fancy designs. By forming a group you learn about new products available, new techniques, designs and equipment that is available to expand upon your hobby. You may also discover new ways to lay out your pages or to secure your memories. This also gives you an audience to show off your favorite memories.
If you love the idea of scrapbooking, but do not have the time to craft your own pages, there are many companies that have pages ready to go. All you have to do is glue your photos on. This can be a little more expensive unless you find them on clearance.
Have fun and enjoy national scrapbook month!