>>5985917>>5985916Bricklink has better prices, but i wouldn't reccommend it to someone with little to no experience with lego.
Just stick to retail or local secondhand sellers for now.
Towball joints are the smaller balljoints that are found in some mixels (pic, top)
The older and more big balljoints have more friction and can support more weight, these can be found in the sets like i mentioned earlier and Bionicle and stuff. (pic, lower)