I'm getting ready to order some stuff and mostly use one of these three.  I kind of like to check them against one another.  After looking at the first item (round rubber) Jan's in way in the lead for my business.

Jan's  $15.04/lb

Barlow's $19.95/lb

Stamina $19.95/lb

Since I am short on brown, red, white, chartruse, and black Jan's wins hands down and backing away.

they are the best for rubber.  The problem I've always had is all the other stuff I ordered offset the cost or didnt have the other stuff.  I do like Janns though good people.  

i just ordered a metric ton of stuff from barlows and fishingskirts.com.  Forgot to buy collars though.  I'm taking it as a sign to hand tie my jigs, but I dunno.

I like the round rubber with one exception...there is no green.  Lime doesn't count.  Just a regular green would be nice.  If they had that, that would probably be all I used.

Look to lurecraft.com for your rubber, they also have the best collars made.