there are a few good ways to get knex nowadays. ill go over a couple of them. and also to the instructables moderators. sorry for my lack of pictures theres none i could get that really apply.
Step 1: My Personal Favorite
i know this very kind lady on ebay named janie. she sells lots of knex that contain key pieces ussually in lots of 1000-2000 pretty cheap. but my favorite thing about her is her custom orders. you can send her a message requestion what ever it is you want, and she will give it to you. to access her page do the following.
1. go to www.ebay.com
2. go to "community"
3. search janieubay
4. hit "items for sale"
5. if you dont see anything that suites what you need go back to her page and select contact member.
6. request what you want.
she will assist you from there
Step 2: YUK Knex.com
ok this is probably a last resort. for a few reasons, one being you cant negotiat price. and secondly because the prices are a little expensive. on the other hand, there brand new never been used, as are janieubay but if you feel more comfortable order straight from the company this is your best bet.
so to order of knex.com
1. go to www.knex.com
2. click the shop drop down menu
3. go to parts and extras
4 add what you want to your cart
Step 3: Thats All
these are the two best ways to get knex, i hope you enjoyed it. and yes i know its mostly self explanatory, but hey i figured id at least help a few people out