Try Smokeless Image Volt - and as always I recommend MANUAL batteries. Only some of their colors are available in manual. They are exactly the same kind of KR808D-1 as Bloog uses. I got a battery there yesterday (a pretty Raspberry color manual). You already have autos. Try manuals. Most people here use and recommend manuals. Manuals are much less likely to be damaged or killed by juice leaks. Manuals won't turn on accidentally from wind or vibration. And in general manuals make it easier to get a good hit because you can press the button is a couple of seconds before you start your drag so there is already good vapor there when you start dragging.
Their batteries are $13-14 and they may still be having 23% off with the code heatwave
Scroll down for batteries
http://smokelessimage.com/accessories.html
Oh duh I thought you were asking about batteries. They have prefilled and blank cartos too and the price is great with the 23% discount.
I also recommend you sign up at Vapor4Life.com (lower left front page) to receive their sale emails - they are also KR808D-1 and have lots of prefilled cartos (though I think many of their fruit flavors are overdone). I love their WOWbacco and WOW Vanilla as well as their hot WOW blank cartos. I will check my email to see if they are having a sale now. YES - 24 hours sale at Vapor4Life ends 11:59 CT 7/21 - 26% off, no order minimum, code is Flash26
Notes - Vapor4Life shipping is higher than SmokelessImage. I have happily used Vapor4Life blank cartos for many months. I stock up on blanks and my fave juices there when they have sales. Nice soft caps with a defined center air channel and no inner seals - the way I like cartos. I have not yet tried Smokeless Image cartos but I ordered some blanks to try. I have not tried Bloog cartos. I heard Smokeless Image would start using the same cartos and juices as Bloog (may have already happened). Vapor4Life's stuff is different - not the same juices.
You can use any real KR808D-1 cartos down to about 2.5ohms. I think anything lower than that is meant for fat battery 901/KR808D-1 threaded models and mods (like Riva 901, PigCig, Elegant Easy - things with 450mah+ batteries). By real I mean the center post of the carto has a recessed channel cut across it for airflow. I don't like some off brands that are not cut like that - they get less air.