I asked this question on another scrapping board I visit...and someone referred me to
www.scrappapers.net. They recently disabled their on-line shopping cart, you will need need to either fax in order or call in order.
Their "Scrap Boxes" are $60 for 300 sheets of 8.5x11 cardstock. 2 sheets of every color (150) they have. Also comes in a nice sturdy plain cardboard box with plastic handle. Good for storage of something. They also sell same in 12x12 -- I THINK $100.
From that home page, click on eyelets to enter list of items sold. It seems the link to the store disappeared when they disable shopping cart --- at least I can't find it. LOL
Also, QVC has some great packages. Over time, I've purchased:
F27819 Crazy for Cardstock 8.5x11 150 sheets $19.80
F27916 Making Memories 98 sheets 12x12 -Watercolor $31.12
F28027 same as above but in Heritage colors
F29285 Designer Prints & solids 125 sheets 12x12 $29.75
and F1085 set of 4 Designer Photo Mat Books $18.17
F1091 Cropping Mats 432 sheets $19.96
Both of these are 6.5" x 4.5"
And LASTLY..... Michael's Craft Store sells something called "THE SLAB". 180 sheets of 12x12 paper from the ColorWheel Paper Collection. 3 sheets each of 60 patterns & colors. 80lb non-coated paper. Each color family has 3 sheets of solid & 3 sheets each of 3 co-ordinating patterns. Really nice - no brainer when trying to match papers! Regular price is $19.?? , but it is on sale very often for around $12. It's a great value.