Where i can find kids printable workbooks online?

The other day when i wasnt too busy at work i was googling preschool printable worksheets and books and i came across a set of 5 workbooks, which there was a fee for but you could print out as many copies as you wanted. The books were around $7.95 each but could be bought together for $25.00 and each contains 50 pages. But stupidly i did not write down the web address and as i was using my work computer the history is cleared regularly so i can not find this site again. Has anyone see similar to what im looking for? Thanks