I buy the surger thread they have at joanns. It's about $2 for a big spool. It lasts a long time!!! I made a little contraption to feed the thread and just set the spool next to my sewing machine on the table. It is sturdy thread too.
Rotary blades...my mom found a good deal on ebay one time. If you can afford it, buy as many as you can(if you find a good deal). We haven't bought them in so long, I don't know where the best place would be to buy them at now.