Mesika loops are very good but for the money, I buy Infinity IET and tie my own. I can get a lifetime supply for about $80. Plus with being able to tie longer loops I can use The Jaxon Infinity loop witch is very large and uses a body hookup that can't be done with the smaller Mesika loops.
http://www.elusionist.com/forums/showthread.php?t=72017
If anyone wants some clear IET, you can send a SASE to me for a sample to play with. Mine is clear so you can dye it black or any color that you deem appropriate depending on performance condition. I use it natural/clear quite often and it is still quite invisible.
PM me