I'm thankful for homeschooling sale boards and the fact that God provided, through the boards, a geometry textbook set for us at a very good price - about 25% of what it would cost to buy the new edition.
I'm also thankful for Paypal and other technology, including the internet. Finding the books without the internet would be virtually impossible. Not having to go to the bank to get a money order, mail it, wait for it to get there, etc. etc. is a huge saving of time and effort for me and it makes the transactions quick and easy. I had an experience this summer of having to deal with someone by sending a cheque and I am doubly thankful now to not have to do that anymore!